Hyperbolic Geometry | Relativity 11 Science4All (english) 2015-07-13 | Believe it or not, my underpants contradict 2000 years of mathematical certainty! It's only in the 19th Century that Gauss, Lobachevsky and, Bolyai would get a grasp on the hidden geometry underlying my underpants --- the so-called hyperbolic geometry... which would lead to new fundamental insights into the nature of geometry itself!Can you glue opposite edges of a square? Nash's embedding | Science4All 7youtube.com/watch?v=Bx0MOMvUxS8What's wrong with that map? Spherical Geometry | Science4All 9youtube.com/watch?v=SZsz3EchTA0What's a straight line? Curved-space geometry | Science4All 10youtube.com/watch?v=n8DB3mGXEUgWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0What's the destiny of the universe? Einstein's biggest blunder | Science4All 18youtube.com/watch?v=ZAiVf4zA6KIThe Massive Puzzles of Gravity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/gravityPlaying Sports in Hyperbolic Space | Numberphile youtube.com/watch?v=u6Got0X41pYMargaret Wertheim: The beautiful math of coral (and crochet) youtube.com/watch?v=zGEDHMF4rLI
Microsoft is endangering national security Science4All (english) 2023-09-25 | Our cybersecurity company: calicarpa.com#TheFabulousEndeavor #Tournesol #Science4AllScript + source: github.com/lenhoanglnh/manuscripts/blob/main/ethics/28-microsoft-en.mdContribute to Tournesol : https://tournesol.app/0:00 Introduction3:46 Half a centure of negligence12:18 The vulnerabilities exposed last summer19:35 What should you do?A huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/v66YDx7U6V0Twitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
TikTok: Xis mighty remote control (ft. @ApresLaBiere) Science4All (english) 2022-11-21 | I explain how TikTok is a Trojan horse, an offering to all the countries of the world which, via the recommendation algorithm under the probable control of the Chinese authorities, could trigger the collapse of democracies.#TheFabulousEndeavor #Tournesol #Science4AllScript + source: github.com/lenhoanglnh/manuscripts/blob/main/ethics/20-tiktok-en.mdJean-Lou's part: docs.google.com/document/d/1guYNynZaPsIIGHb1FDlffcBvf7HQLXeUhnLEW5YkkTIContribute to Tournesol : https://tournesol.app/0:00 Introduction2:45 What is TikTok?6:59 Is TikTok under Xi's control?9:35 The geopolitical stakes19:22 Remote controls: Trojan horses?23:29 The algorithmic governance problem29:21 ConclusionA huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/iW0LiIMYqrUTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Google poisoned the science community, which now amplifies its disinformation Science4All (english) 2022-10-17 | This video debunks 4 dangerously misleading scientific papers, all with a Google co-author, that denigrate the urgent need for massive audits and investments in security and ethics. Terrifyingly, the scientific community has scientifically validated and massively propagated what appears to be intentional disinformation.#TheFabulousEndeavor #Tournesol #Science4AllScript + source: docs.google.com/document/d/1MZinEbqdCyvssBWHsX2Qjrv91UlPtTL8OHPQ3gqHO7k/edit?usp=sharingFrench version: youtu.be/1YiDpzD42Bg0:00 IntroductionPart 1 The (non-)protection of sensitive information06:53 Machine learning learns from personal data10:37 Federated learning12:55 The (non-)protection of sensitive information17:48 The scientific community is massively amplifying the disinformation20:45 My scientific debunking work24:42 Differential privacy… and its limits27:34 More disinformation on the privacy of large language modelsPart 2 The (non-)security against disinformation30:32 Data is manipulating algorithms32:22 Defend with “new algorithms” ?35:34 Our NeurIPS debunking37:52 The dangerous assumption that all scholars make41:25 Google's “practical, production” federated learning environment45:48 Our debunking is again ignored by the science community...47:34 Data generalization: a politically (and financially) motivated assumption?Conclusion52:34 Ethics and security urgently require massive funding57:01 Ethical research: Tournesol59:42 Help us make academic research more secure and ethicalA huge thank you to all the reviewers of the video, most of which are volunteers of the Tournesol Association ❤️🌻Contribute to Tournesol : https://tournesol.app/Twitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
5 Superpowerful AIs Science4All (english) 2022-06-19 | Too often, AI discussions focus on flawed examples of AIs, because these examples actually have minor impacts on societies. Today, I discuss a top 5 of the most powerful of today's algorithms, which are surprisingly and disturbingly way too little known.#TheFabulousEndeavor #Tournesol #science4all #AI #artificialintelligence #tekfog #xiaoice Script + source: docs.google.com/document/d/1ZOPrLFlZ7Dj9Qh95YWSfwDGrXmnYt53HPSbUpAzXEyYContribute to Tournesol : https://tournesol.app/0:00 Introduction2:16 5. Autonomous weapons7:17 4. Tekfog13:59 3. Xiaoice18:38 2. Pathways26:17 1. Aladdin31:48 ConclusionA huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/lYXQvHhfKuMTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
My Ukrainian friend’s heartbreaking call for academics’ help Science4All (english) 2022-04-11 | Anastasiia Kucherenko called the scientific community to more actively combat disinformation, to save the millions of lives endangered by hate speech and calls to violence.#Ukraine #War #Tournesol #TheFabulousEndeavor #Science4AllA huge thank you to EPFL and to Alain Herzog, to allow republishing Anastasiia's talk, under CC BY-SA 4.0 license.Script + source: docs.google.com/document/d/1ASaSfFKQJGf0XWAox1UROkjhKwdwRGRAzXKy88IXDVEContribute to Tournesol : https://tournesol.app/0:00 Introduction2:20 Anastasiia Kucherenko's talk5:30 My commentsA huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/mpuG5pVvefsTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Human trafficker and hate dealer #FacebookFiles Science4All (english) 2021-12-06 | Frances Haugen recently revealed a huge amount of internal communications at Facebook, which show in a very incriminating way that the company's executives made decisions that were both very immoral, but also illegal. According to various lawyers and investors, these executives should go to jail.#FacebookFiles #FrancesHaugen #TheFabulousEndeavor #Tournesol #Science4AllScript + source: docs.google.com/document/d/1POViovo-U32PLCvwR9eB6rBmST74OPoRNN3GWJ_W9U4/editContribute to Tournesol : https://tournesol.app/0:00 Introduction3:55 Complicity to human trafficking12:31 Collusions with dictators20:22 Merchant of hate35:29 Conclusion : Zuckerberg in prison ?A huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/sAjm3-IaRtITwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantierSmartPoop 1.0 (with Tristan Le Magoarou):bit.ly/smartpoop
Tournesol: We need YOU!! (Two job offers!!) Science4All (english) 2021-06-21 | EPFL is recruiting a a research engineer and a postdoctoral research, to work on the development of Tournesol.#TheFabulousEndeavor #Tournesol #Science4AllEngineer offer : https://recruiting.epfl.ch/Vacancies/1855/Description/3Postdoc offer : https://recruiting.epfl.ch/Vacancies/1856/Description/3Github : github.com/tournesol-appDiscord : discord.gg/TvsFB8RNBVWhite Paper : dropbox.com/s/tdvbskpfwn2t39z/Tournesol__White_Paper_.pdf?dl=0Donation: https://tournesol.appOur three latest papers on robust (strategyproof) machine learning :arxiv.org/abs/2008.00742arxiv.org/abs/2106.02398 arxiv.org/abs/2106.02394 Script + source: docs.google.com/document/d/1ZtWuingLTOQ4B1_hp7VTDU8m81HRvufKk2ATDjVffyo/edit?usp=sharingContribute to Tournesol : https://tournesol.app/0:00 Introduction1:20 Web development4:03 Research6:31 Other ways to contributeA huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻French version: youtu.be/_dWCNUxGJyITwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
The 51% Attack Science4All (english) 2021-05-24 | Tournesol restricts participation in the platform, to protect itself from the 51% attack. In this video, I insist on the importance of this protection, without which Tournesol would be arbitrarily manipulated by malicious entities.#TheFabulousEndeavor #Tournesol #Science4AllScript + source: docs.google.com/document/d/1XNBZd-lf1nxNkb5zpFgXL8dLuW8UxjlAA0FKAhl-WSY/edit?usp=sharingContribute to Tournesol : https://tournesol.app/0:00 Introduction2:57 The 51% attack in Silicon Valley5:30 Proof of Work7:51 Proof of Personhood10:57 Byzantine-resilient learning algorithmFrench version: youtu.be/8gH-sYnJez4A huge thank you to all the reviewers of the video, most of which are members of the Tournesol Association ❤️🌻Twitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
What’s a message of public utility? Science4All (english) 2021-05-03 | What is the best video on any YouTube to recommend on the topic of climate change? This video describes the quality criteria used by #Tournesol to answer this question.#TheFabulousEndeavor #Tournesol #Science4AllThe comment of the thumbnail is taken from this video: youtube.com/watch?v=gxAaO2rsdIsScript + source: docs.google.com/document/d/1UWkx7sFkpvYgQcRmQqdZU6PnriqkV0HLTnmecgOj94E/edit?usp=sharingContribute to Tournesol : https://tournesol.app/0:00 Introduction3:14 Reliable and not misleading6:03 Engaging and thought-provoking10:12 Important and actionable12:29 Other quality criteriaFrench version: youtube.com/watch?v=LZGhBmDVi5ATwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Lets Solve Ethics Collaboratively!! Science4All (english) 2021-04-19 | The ethics of today's most influential decisions is usually centralized and opaque. In 2019, the WeBuildAI framework has been proposed to make ethical decisions both collaborative and transparent, thereby opening new appealing possibilities for the future of ethics.#TheFabulousEndeavor #Tournesol #Science4AllScript + source: docs.google.com/document/d/1xys1ShTO80KbWIjQTVOKlG000zYjQwwbPEVWoEToQq0Contribute to Tournesol🌻 : https://tournesol.app/0:00 Introduction1:53 The dilemmas of WeBuildAI5:17 Virtual democracy8:12 Designing the algorithmic representatives10:43 Pedagogy and Trust13:40 ConclusionFrench version: youtu.be/TgB9pHZ0YPMTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Data is manipulating the algorithms Science4All (english) 2021-04-05 | Today's most influential algorithms learn from data. But then, if the data is biased, misleading, or fabricated, then the algorithms that learn from that data will also be biased and misleading. Thus, there will be no algorithmic safety in machine learning without a massive, reliable and secure database with human preferences.#TheFabulousEndeavor #Tournesol #AIEthicsScript + sources : docs.google.com/document/d/e/2PACX-1vQ5OppMM-rtQ6zqbAeti2UoC2zmyiMjU9HmzXHZKky1EvN5OLmy8oMOZu5a4cC4p1vMTbsDAnYdSeZV/pub0:00 Tay versus Xiaoice2:05 Data manipulates algorithms5:00 Massive web data are out of control10:37 Secured training databaseFrench version: youtu.be/7kIt0lL6m-UTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Millions of billions of dilemmas Science4All (english) 2021-03-22 | Every algorithmic recommendation is in fact a dilemma, especially on complex subjects like nuclear power. Unfortunately, the number of these dilemmas brings us to scales that are unmanageable for us humans.#AIEthics #MakeAIEthical #TournesolScript + sources : docs.google.com/document/d/e/2PACX-1vQvi-8g-xoXdR99_Gu6NmYyc__y786_mponOa_c0nqUcqWMeZ65NX8JBpIDJUDeNAu38LgVYTQGIm6v/pub0:00 Introduction 2:34 Every recommendation is a dilemma6:39 A matter of spontaneous recommendations8:55 Astronomical scales12:57 Algorithms are already vastly superhumanVersion française : youtu.be/BfGhNeEd9NkTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Social Medias are Dangerous. Very Dangerous. Science4All (english) 2021-03-13 | Disinformation campaigns have invaded all influential social networks, as all kinds of entities have huge incentives to pollute or bias public opinion. This makes social networks dangerous.#TheFabulousEndeavor #AIEthics #TournesolScript + source : docs.google.com/document/d/e/2PACX-1vS6wJjFCknSaoA6FyFVzy-eIm1FOBEDaYC98m8iPADvPRtaXba2xdCr3hn3OcIg7Hk3I_7VaGbUnXeZ/pub0:00 Introduction1:45 Cyber war8:56 La bataille de l'attention14:02 Comment rendre les réseaux sociaux bénéfiques ?Version française : youtube.com/watch?v=utWMGi8HTjYTwitter : twitter.com/le_science4allFacebook : facebook.com/Science4AllorgThe Equation of Knowledge: https://laboutique.edpsciences.fr/produit/1035/9782759822614/La%20formule%20du%20savoirLe fabuleux chantier (with El Mahdi El Mhamdi, in French, translation under work) :https://laboutique.edpsciences.fr/produit/1107/9782759824304/Le%20fabuleux%20chantier
Galileo Galilei, Aristotles Murderer | Genius 3 Science4All (english) 2016-05-12 | Galileo Galilei is sometimes regarded as the man who defended science over religion. But this seems inaccurate. Rather, Galileo seems to have fought Aristotle all his life, and those that believed in Aristotle.
Minkowskis Spacetime | Relativity 23 Science4All (english) 2016-03-23 | Imagine trying to put Sheldon Flash Cooper in cage? While in the frame of the cage, Sheldon gets contracted and fits in the cage, we seem to have to conclude the exact opposite from Sheldon's frame. In this episode, we solve this apparent paradox using Minkowski's diagrams.Space contraction and time dilation | Relativity 6youtube.com/watch?v=KLsFYofL5DcL'espace-temps de Minkowski | Science4All (français)youtube.com/watch?v=KmSsEv61IHwCan you trust your eyes in spacetime? Space Time | PBS Digital Studioyoutube.com/watch?v=P4rW_pPbD-UEinstein and the special theory of relativity | Minute Physicsyoutube.com/watch?v=ajhFNcUTJI0
What does E=mc² really mean? Relativity 22 Science4All (english) 2016-03-18 | E=mc² is probably the most beautiful equation of physics. Yet, its deep and subtle meaning is often misappropriated! In this video, I work out Einstein's original thoughts to better understand the message he intended to convey.La relativité restreinte | Relativité 5 + Défi Lê 1 | Science4All (français)youtube.com/watch?v=bIJBoElJkoESpecial Relativity Explained | Relativity 6youtube.com/watch?v=KLsFYofL5DcDoes the Inertia of a Body Depend Upon its Energy Content? Albert Einsteinhttp://einsteinpapers.press.princeton.edu/vol2-trans/186?ajaxEinstein's Proof of E=mc² | Minute Physicsyoutube.com/watch?v=hW7DW9NIO9MThe Real Meaning of E=mc² | Space Time | PBS Digital Studioyoutube.com/watch?v=Xo232kyTsO0Your Mass is NOT From the Higgs Boson | Veritasiumyoutube.com/watch?v=Ztc6QPNUqlsThe True Nature of Mass and Matter | Space Time | PBS Digital Studioyoutube.com/watch?v=gSKzgpt4HBU
How far can a pile of cards go? Logic 3 Science4All (english) 2016-02-10 | Take a pile of cards and try to get it leaning away from a table as far as possible. How far can that go? Can it go to infinity? What's pretty cool is that this basic problem will lead us to discuss the harmonic series, infinite divergent sums and natural logarithms...
0 99999... = 1??? Zeno vs infinite sums | Logic 2 Science4All (english) 2016-01-17 | Zeno once cleverly argued that Achilles could never overtake a tortoise ahead of him. For 2,000 years, this troubling argument would be a hurdle that would prevent any meaningful use of infinity. But the key to understand it all lies in the equally troubling equality 0.99999... = 1.How big can numbers be? Googols and Graham | Science4All 22 youtube.com/watch?v=qDkM7hMe_xg9.999... reasons that .999... = 1 | ViHartyoutube.com/watch?v=TINfzxSnnIEWhy does 1=0.999...? Singing Bananayoutube.com/watch?v=G_gUE74YVosSupertasks | VSauceyoutube.com/watch?v=ffUnNaQTfZEZeno's Paradox | Numberphileyoutube.com/watch?v=u7Z9UnWOJNYWhat is Zeno's Dichotomy Paradox? - Colm Kelleher | TedEdyoutube.com/watch?v=EfqVnj-sgcc
How big can numbers be? Logic 1 Science4All (english) 2015-12-02 | In the new series on math foundations, we'll be talking a lot about infinity. But before reaching the infinite, let's first go through the biggest numbers of mathematics... if that's even possible...0 99999... = 1??? Zeno vs infinite sums | Science4All 23 youtube.com/watch?v=s-JZ138fKcoGoogol and Googolplex | Numberphileyoutube.com/watch?v=8GEebx72-qsWhat is Graham's Number? (feat Ron Graham) | Numberphileyoutube.com/watch?v=HX8bihEe3nAThank you to Johan Mazoyer and Nicolas Tupégabet for feedbacks on the script. Check their podcast: http://podcastscience.fm
Logic and Math Foundations | Trailer Science4All (english) 2015-11-21 | Launching the next series on Logic and Math Foundations, with a quick recap of the series on General Relativity.
The Poincaré conjecture | Relativity 21 Science4All (english) 2015-11-13 | Could a universe without border, not go on and on forever?Poincaré not only gave an answer, he also proposed a fundamental conjecture...Poincaré Conjecture and Homotopy | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/poincare-conjectureCan you glue opposite edges of a square? Nash's embedding | Science4All 7youtube.com/watch?v=Bx0MOMvUxS8What's wrong with that map? Spherical Geometry | Science4All 9youtube.com/watch?v=SZsz3EchTA0Topology | MyWhyUyoutube.com/watch?v=p2ofJPh2yMwyoutube.com/watch?v=n8Sb29BSZcYyoutube.com/watch?v=29LoQVbEa7wPoincaré Conjecture | Numberphileyoutube.com/watch?v=GItmC9lxecoRicci Flow | Numberphileyoutube.com/watch?v=hwOCqA9Xw6AEuler’s Formula and the Utilities Problem | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/eulers-formula-and-the-utilities-problemHomotopy Type Theory and Higher Inductive Types | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/homotopy-type-theory
Twin & Grandfather Paradox | Science4All 20 Science4All (english) 2015-11-07 | Leave your twin on Earth while you travel across the universe. When you come back, will you be younger or older than your twin? The answer lies in (gravitational) time dilationSpacetime of general relativity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativityIs special relativity relative? Time dilation and space contraction | Science4All 6 youtube.com/watch?v=KLsFYofL5DcAre astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0What proved general relativity? Einstein's heart palpitations | Science4All 17 youtube.com/watch?v=IxS_4Z6_wBASpecial Relativity and the Twin Paradox | Physics Girlyoutube.com/watch?v=ERgwVm9qWKA
Cant you see the Big Bang? Relativity 19 Science4All (english) 2015-10-31 | One of the most amazing thing about our universe is that we can see its baby picture by just looking up there. What's equally surprising is that it's only 50 years ago that we have seen this baby picture! Before that, Big Bang theories sounded ridiculous, especially because of Hubble... The key to understand it all is the cosmological microwave background (CMB) and the Doppler effect!What's the destiny of the universe? Einstein's biggest blunder | Science4All 18youtube.com/watch?v=ZAiVf4zA6KISpace Used to Be Orange!! | Space Time | PBS Digital Studiosyoutube.com/watch?v=3tCMd1ytvWgDo We Expand With The Universe? Minute Physicsyoutube.com/watch?v=th_9ZR2I0_wPicture of the Big Bang (a.k.a. Oldest Light in the Universe)youtube.com/watch?v=_mZQ-5-KYHwWhat's gravitational time dilation? Twin & Grandfather paradox | Science4All 20youtube.com/watch?v=wV9yqfNQTgo
Albert Einstein, the iconic figure of science | Genius 2 Science4All (english) 2015-10-29 | Will there ever even be another Einstein? Doubtful. Einstein not only is a great genius, he's also and most importantly the iconic figure of science, in its purest and greatest formThe Speed of Light is NOT About Light | Space Time | PBS Digital Studiosyoutube.com/watch?v=msVuCEs8YdoIs special relativity relative? Space contraction and time dilation | Science4All 6youtube.com/watch?v=KLsFYofL5DcThe Real Meaning of E=mc² | Space Time | PBS Digital Studiosyoutube.com/watch?v=Xo232kyTsO0Are astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0What proved general relativity? Einstein's heart palpitations | Science4All 17youtube.com/watch?v=IxS_4Z6_wBAEPR Paradox and Entanglement | Quantum Mechanics ep 8youtube.com/watch?v=5HJK5tQIT4AProof of Bell's theoremyoutube.com/watch?v=7zfnvGXpy-g
Einsteins biggest blunder | Relativity 18 Science4All (english) 2015-10-22 | Because the young Einstein couldn't accept the possibility of a universe with an end of time, he made obscure modifications to his equations... He would later call this the biggest blunder of his life! Yet, these days, these obscure modifications may somehow shed some light on an even darker secret of our universe...What's Einstein's gravity? General relativity explained! Science4All 15 youtube.com/watch?v=zZDoSpiIxs0What proved general relativity? Einstein's heart palpitations | Science4All 17youtube.com/watch?v=IxS_4Z6_wBACan't you see the Big Bang? CMB and Doppler effect | Science4All 19youtube.com/watch?v=jEtZ_eoHY10Do We Expand With The Universe? Minute Physicsyoutube.com/watch?v=th_9ZR2I0_wEinstein's Famous Blunder - Sixty Symbolsyoutube.com/watch?v=nJsFsjSWYx0
Einsteins heart palpitations | Relativity 17 Science4All (english) 2015-10-14 | This video retraces Einstein's footsteps towards worldwide celebrity. From his first steps into a theory of spacetime curvature to his epic dual with the greatest mathematician of that time and to the eventual confirmation of his theory through eclipse observation. At last, Einstein had triumphed!John Earman and Clark Glymour. Lost in the Tensors: Einstein's Struggles with Covariance Principles, 1912-1916: http://repository.cmu.edu/cgi/viewcontent.cgi?article=1338&context=philosophyWhy has Pluto ever been a planet? History of planet discoveries | Science4All 2youtube.com/watch?v=0SUs_o6EEVsIs special relativity relative? Space contraction and time dilation | Science4All 6youtube.com/watch?v=KLsFYofL5DcAre astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0Is gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8What's the destiny of the universe? Einstein's biggest blunder | Science4All 18youtube.com/watch?v=ZAiVf4zA6KI
Is gravity acceleration or curvature? Relativity 16 Science4All (english) 2015-10-08 | Not many general relativity popularizations distinguish acceleration and curvature, and even suggest that gravity is... both. I know I did. Yet, these are mathematically very, very distinct. So, allow me to clarify myself by drawing the line between what gravity is, and what it is not!The Massive Puzzle of Gravity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/gravitySpacetime of General Relativity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativityDon't heavier objects fall faster? Galileo's Thought Experiment | Science4All 12youtube.com/watch?v=Vz9q-TuBrgoHow did Newton figure out gravity? On the shoulders of giants | Science4All 13youtube.com/watch?v=tHq3_0dxLQ0Are astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0What proved general relativity? Einstein's heart palpitations | Science4All 17 youtube.com/watch?v=IxS_4Z6_wBAIs Gravity An Illusion? | Space Time | PBS Digital Studiosyoutube.com/watch?v=NblR01hHK6UCan a Circle Be a Straight Line? | Space Time | PBS Digital Studiosyoutube.com/watch?v=D3GVVkPb3OICan You Trust Your Eyes in Spacetime? | Space Time | PBS Digital Studiosyoutube.com/watch?v=P4rW_pPbD-UGeneral Relativity & Curved Spacetime Explained! | Space Time | PBS Digital Studiosyoutube.com/watch?v=AwhKZ3fd9JAWhat's gravitational time dilation? Twin & Grandfather paradox | Science4All 20youtube.com/watch?v=wV9yqfNQTgo
General relativity explained! Relativity 15 Science4All (english) 2015-09-28 | Last time, we saw that Einstein explains the falling of the apple by the upwards acceleration of the ground. This is Einstein's happiest thought. But wouldn't this imply that the surface of the Earth is expanding outwards? Well, no. Why? Because of spacetime curvature! At last, this video explains how Einstein's gravity really works.Warning! This video is a bit more technical than usual, and previous videos are prerequisites to fully grasp this one. They include:Is special relativity relative? Time dilation and space contraction | Science4All 6 youtube.com/watch?v=KLsFYofL5DcWhat's wrong with that map? Spherical Geometry | Science4All 9youtube.com/watch?v=SZsz3EchTA0What's a straight line? Curved-space geometry | Science4All 10youtube.com/watch?v=n8DB3mGXEUgWhat's the geometry of my underpants? Hyperbolic Geometry | Science4All 11youtube.com/watch?v=PBDcMrq-BSQAre astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUMore to understand general relativity...Spacetime of General Relativity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativityIs gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8Is Gravity An Illusion? | Space Time | PBS Digital Studiosyoutube.com/watch?v=NblR01hHK6UGeneral Relativity & Curved Spacetime Explained! | Space Time | PBS Digital Studiosyoutube.com/watch?v=AwhKZ3fd9JAWhat proved general relativity? Einstein's heart palpitations | Science4All 17 youtube.com/watch?v=IxS_4Z6_wBAWhat's the destiny of the universe? Einstein's biggest blunder | Science4All 18youtube.com/watch?v=ZAiVf4zA6KIWhat's gravitational time dilation? Twin & Grandfather paradox | Science4All 20youtube.com/watch?v=wV9yqfNQTgo
Einsteins happiest thought | Relativity 14 Science4All (english) 2015-09-16 | In 1907, Einstein had the happiest thought of his life, the one that would initiate an 8-year-old seemingly impossible quest for a theory of gravity. While the theory is awfully complex, the thought that led Einstein therefore is wonderfully simple... and has to do with astronauts' weightlessness.The Massive Puzzle of Gravity | Science4All.org http://www.science4all.org/le-nguyen-hoang/gravityDon't heavier objects fall faster? Galileo's Thought Experiment | Science4All 12youtube.com/watch?v=Vz9q-TuBrgoHow did Newton figure out gravity? On the shoulders of giants | Science4All 13youtube.com/watch?v=tHq3_0dxLQ0What's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0Is gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8Why Are Astronauts Weightless? Veritasiumyoutube.com/watch?v=iQOHRKKNNLQThe Physics of Weightless Flight ft Emily Calandrelli | Physics Girlyoutube.com/watch?v=7v-viGyoZAU
How did Newton figure out gravity? Relativity 13 Science4All (english) 2015-09-08 | The theory of gravity did not fall from trees. It took a giant, standing on the shoulders of other giants. Building upon Descartes' algebraic geometry, Galileo's law of falling objects and Kepler's law of planetary orbits, Newton would mark History, as he would infer the fundamental laws of motion and gravity.The Massive Puzzle of Gravity | Science4All Articlehttp://www.science4all.org/le-nguyen-hoang/gravityDon't heavier objects fall faster? Galileo's Thought Experiment | Science4All 12youtube.com/watch?v=Vz9q-TuBrgoAre astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0Is gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8What proved general relativity? Einstein's heart palpitations | Science4All 17youtube.com/watch?v=IxS_4Z6_wBA
Dont heavier objects fall faster? Relativity 12 Science4All (english) 2015-08-24 | It's often said that Galileo proved by experiment that objects all fall at the same rate. But that can't be true, as everyday experience shows that heavier objects do fall faster. So, why did nevertheless he claim that all objects fall at the same rate?The Massive Puzzle of Gravity | Science4All.org http://www.science4all.org/le-nguyen-hoang/gravityHow did Newton figure out gravity? On the shoulders of giants | Science4All 13youtube.com/watch?v=tHq3_0dxLQ0Are astronauts weightless? Einstein's happiest thought | Science4All 14youtube.com/watch?v=9s2tObpO_rUIs gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8
Curved-space geometry | Relativity 10 Science4All (english) 2015-06-29 | There's a fine line between straight and curved lines... Or is there not? What's a straight line (in a curved space)?What's wrong with that map? Spherical Geometry | Science4All 9youtube.com/watch?v=SZsz3EchTA0What's the geometry of my underpants? Hyperbolic Geometry | Science4All 11youtube.com/watch?v=PBDcMrq-BSQWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0Is gravity acceleration or curvature? Follow-up clarifications | Science4All 16youtube.com/watch?v=WbhUsPuioN8What proved general relativity? Einstein's heart palpitations | Science4All 17 youtube.com/watch?v=IxS_4Z6_wBAWhat's the destiny of the universe? Einstein's biggest blunder | Science4All 18youtube.com/watch?v=ZAiVf4zA6KISpacetime of General Relativity | Science4All Article http://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativity
Whats wrong with that map? Relativity 9 Science4All (english) 2015-06-15 | Maps are wonderful to picture our planet Earth! But they are also deeply misleading... All of them. And there's a fundamental theorem behind this!Can you glue opposite edges of a square? Nash's embedding | Science4All 7youtube.com/watch?v=Bx0MOMvUxS8Why do soccer balls have the shape they have? Platonic solids | Science4All 8youtube.com/watch?v=JfkYeZqpHVgWhat's a straight line? Curved-space geometry | Science4All 10youtube.com/watch?v=n8DB3mGXEUgWhat's the geometry of my underpants? Hyperbolic Geometry | Science4All 11youtube.com/watch?v=PBDcMrq-BSQCould space be finite? Poincare conjecture | Science4All 21 youtube.com/watch?v=dNQuzmA42vwMaps by Jason Davies jasondavies.com/maps/transitionNon-Euclidean Geometry and Map-Making | Science4All Articlehttp://www.science4all.org/scottmckinney/non-euclidean-geometry-and-map-making
The shapes of soccer balls | Relativity 8 Science4All (english) 2015-06-02 | Soccer balls are iconically made of hexagons and pentagons. But why? Why did Adidas choose this beautifully symmetric shape? The answers lie in the geometry of Platonic solids, and, in particular, of the truncated icosahedron. But there's more. In recent years, Adidas's balls were actually designed based on the tetrahedron and the cube...The Cubic Ball of the 2014 World Cup | Science4All (article) http://www.science4all.org/le-nguyen-hoang/brazucaCan you glue opposite edges of a square? Relativity 7youtube.com/watch?v=Bx0MOMvUxS8
John Nash, a Beautiful Mind | Genius 1 Science4All (english) 2015-05-27 | Nobel prize winner John Nash passed away on May 23rd, 2015. He was 86. He had lived an amazing and difficult life. Early on, he was a mathematical prodigy who faced and solved several of the toughest problems of his time. However, at the top of his mathematical genius, he fell into paranoid schizophrenia. After 30 years of struggle with this terrible disease, he miraculously recovered and tamed his demons. Allow me to pay tribute to this beautiful mind.
Can you glue opposite edges of a square? Relativity 7 Science4All (english) 2015-05-22 | This is a conundrum that many of the greatest mathematicians couldn't figure out. While John Nash did answer yes - by proving the wonderful Nash isometric embedding theorems - he couldn't say how. After 160 years of research, the Hévéa project finally did it! And it is spectacularly beautiful!Hévéa Project: http://hevea.imag.frThe Tortuous Geometry of the Flat Torus | Science4All Article http://www.science4all.org/le-nguyen-hoang/flat-torusWhy do soccer balls have the shape they have? Platonic solids | Science4All 8youtube.com/watch?v=JfkYeZqpHVgWhat's Einstein's gravity? General relativity explained! Science4All 15youtube.com/watch?v=zZDoSpiIxs0Could space be finite? Poincare conjecture | Science4All 21 youtube.com/watch?v=dNQuzmA42vw
Space contraction and time dilation | Relativity 6 Science4All (english) 2015-05-14 | What if space and time were relative? This was Einstein's insight that led him to a revolutionary understanding of our universe. But this insight was not based on the idea of relativity...Einstein's happiest thought | Relativity 14youtube.com/watch?v=9s2tObpO_rUGeneral relativity explained! Relativity 15youtube.com/watch?v=zZDoSpiIxs0Is gravity acceleration or curvature? Relativity 16youtube.com/watch?v=WbhUsPuioN8Twin & Grandfather paradox | Relativity 20youtube.com/watch?v=wV9yqfNQTgo
Can you add colours? Relativity 5 Science4All (english) 2015-05-05 | You've probably learned early on that there are three primary colours. But why three? And why these three? And what does it have to do with "adding" colours? Is the "addition" of colours even an addition? Surprisingly, the answer lies in the beautiful mathematics of linear algebra and (high) dimension spaces!See more:Colours and Dimension: http://www.science4all.org/le-nguyen-hoang/colours-and-dimensionsColors: It's not just about Wavelengths: http://www.science4all.org/le-nguyen-hoang/colorsWhat's a straight line? Curved-space geometry | Science4All 10youtube.com/watch?v=n8DB3mGXEUg
Could the Earth be flat? Relativity 4 Science4All (english) 2015-04-29 | Over 2,000 years ago, the Greek scholar Eratosthenes proved that the Earth was round and measured its size using only a stick and a camel. And yet, if intelligent aliens ever fly to Earth, they'll probably rather reckon that the Earth is flat... Here's why!See more:Spacetime of Special Relativity: http://www.science4all.org/le-nguyen-hoang/spacetime-of-special-relativityModel-Dependent Realism: http://www.science4all.org/le-nguyen-hoang/model-dependent-realism
Linearization | Relativity 3 Science4All (english) 2015-04-16 | What's 10% up followed by 10% down? Not 0% up. But almost. The study of why that is has led to major developments in the History of mathematics, like the invention of calculus, which have been instrumental in the developments of science: Linearization. But its overuse conceals its fundamental limitations...See more:Linear Algebra and Higher Dimensions: http://www.science4all.org/le-nguyen-hoang/linear-algebraColours and Dimensions: http://www.science4all.org/le-nguyen-hoang/colours-and-dimensionsDifferential Calculus: http://www.science4all.org/le-nguyen-hoang/differential-calculus
History of planet discoveries | Relativity 2 Science4All (english) 2015-04-05 | Pluto has recently been demoted from its planetary status. With a bit of hindsight, what's surprising about this demotion is not that Pluto is no longer a planet; it's that it ever was regarded as a planet. And the reason for that lies in a nice piece of History.Pluto is NOT (not?) a planet | Science4Allhttp://www.science4all.org/le-nguyen-hoang/plutoWhat proved general relativity? Einstein's heart palpitations | Science4All 17youtube.com/watch?v=IxS_4Z6_wBA
Why is π so interesting? Relativity 1 Science4All (english) 2015-03-23 | Pi is a favorite of both amateur and professional mathematicians. Why is that? What is it that makes this number so special? I'll argue that the answer lies both in its ubiquity and its evasiveness.See more:Numbers and Constructibility: http://www.science4all.org/le-nguyen-hoang/numbers-and-constructibilityEuler's Identity: http://www.science4all.org/le-nguyen-hoang/eulers-identityThe Magic of Analysis: http://www.science4all.org/le-nguyen-hoang/analysisHypothesis Test: http://www.science4all.org/le-nguyen-hoang/hypothesis-test-with-statistics
Lets Start a New Series of Videos! Science4All 0 Science4All (english) 2015-03-16 | This video introduces a new series of videos that I'll be making hopefully more regularly than the videos I've uploaded so far. Stay tuned!
Honnêteté, Équité et Horaires - Soutenance de thèse Science4All (english) 2014-11-23 | Soutenance de thèse de doctorat de Lê Nguyên Hoang à l'École Polytechnique de Montréal sur la "conception bayésienne de mécanismes et quantification de l'équité appliquées à la construction d'horaires personnalisés", présentée le 17 novembre 2014.publications.polymtl.ca/1668
La Magie des Maths de Prépa (2/2) - Lanalyse Science4All (english) 2014-10-16 | Dans cette série, je propose de vous révéler la magie des mathématiques des classes préparatoires aux Grandes Écoles. Ce second épisode porte sur l'analyse.Visitez la chaîne francophone de Science4All : youtube.com/channel/UC0NCbj8CxzeCGIF6sODJ-7AChapitre 1 - Pi (1:13)Chapitre 2 - Séries et dérivées (7:42)Chapitre 3 - Équations différentielles (22:21)Chapitre 4 - Topologie (38:20)Voici le premier : youtube.com/watch?v=wENkW8SXYXw.Aidez-moi à m'améliorer en remplissant le questionnaire suivant :docs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewform?usp=send_formdocs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewanalyticsPour en savoir plus, allez-voir ces liens !Calcul différentiel : http://www.science4all.org/le-nguyen-hoang/differential-calculusSéries infinies : http://www.science4all.org/le-nguyen-hoang/infinite-seriesIdentité d'Euler : http://www.science4all.org/le-nguyen-hoang/eulers-identityAnalyse de Fourier : http://www.science4all.org/le-nguyen-hoang/fourier-analysisRésonance : http://www.science4all.org/le-nguyen-hoang/resonanceTopology : http://www.science4all.org/le-nguyen-hoang/topologyConjecture de Poincaré : http://www.science4all.org/le-nguyen-hoang/poincare-conjectureMerci à tous ceux qui ont participé à ce projet !Musiques :Jason Shaw (http://www.audionautix.com/index.php)J. Lang, Snowflake, Admiral Bob, Onlymeith, Colab (http://dig.ccmixter.org)Chris Zabriskie, Kevin MacLeod (http://freemusicarchive.org)
La Magie des Maths de Prépa (1/2) - Lalgèbre Science4All (english) 2014-09-17 | Dans cette série, je propose de vous révéler la magie des mathématiques des classes préparatoires aux Grandes Écoles. Ce premier épisode porte sur l'algèbre. Voici le second : youtube.com/watch?v=DRciHKXWneA.Visiter la chaîne francophone de Science4All :youtube.com/channel/UC0NCbj8CxzeCGIF6sODJ-7AChapitre 1 - Al-Jabr (1:13)Chapitre 2 - La géométrie algébrique (12:11)Chapitre 3 - La théorie des nombres (17:51)Chapitre 4 - L'algèbre moderne (29:04)Chapitre 5 - L'algèbre linéaire (40:51)Aidez-moi à m'améliorer en remplissant le questionnaire suivant :docs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewform?usp=send_formdocs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewanalyticsPour en savoir plus, allez-voir ces liens !La magie de l'algèbre : http://www.science4all.org/le-nguyen-hoang/algebraEllipses, paraboles et hyperboles : http://www.science4all.org/le-nguyen-hoang/ellipses-parabolas-hyperbolasCryptographie et théorie des nombres : http://www.science4all.org/scottmckinney/cryptography-and-number-theoryCryptographie et physique quantique : http://www.science4all.org/scottmckinney/cryptography-and-quantum-physicsP versus NP : http://www.science4all.org/le-nguyen-hoang/pnpThéorie de Galois : http://www.science4all.org/le-nguyen-hoang/galois-theoryRelativité restreinte : http://www.science4all.org/le-nguyen-hoang/spacetime-of-special-relativityRelativité générale : http://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativityAlgèbre linéaire : http://www.science4all.org/le-nguyen-hoang/linear-algebraProgrammation linéaire : http://www.science4all.org/le-nguyen-hoang/linear-programmingPhysique quantique : http://www.science4all.org/le-nguyen-hoang/quantum-mechanicsMerci à toutes les participantes concernées de près ou de loin par ce projet !Musiques :Jason Shaw (http://www.audionautix.com/index.php)J. Lang, Snowflake, Admiral Bob, Onlymeith, Colab (http://dig.ccmixter.org)Chris Zabriskie, Kevin MacLeod (http://freemusicarchive.org)
La Magie des Maths de Prépa - Trailer Science4All (english) 2014-09-07 | Voici la 2ème bande annonce du documentaire sur la magie des mathématiques des classes préparatoires. Le documentaire sera composé de deux épisodes d'une heure chacun. Le 1er épisode portera sur l'algèbre et paraîtra le 17 septembre.Le 2nd épisode portera sur l'analyse et paraîtra le 15 octobre.Abonnez-vous pour ne pas le rater !Musiques : Discovery Hit by Kevin MacLeodhttp://incompetech.com/music/royalty-free/index.html?isrc=USUAN1300023Black Vortex by Kevin MacLeodhttp://incompetech.com/music/royalty-free/index.html?isrc=USUAN1300037House of Evil by Jason ShawA Brighter Heart by Jason Shawhttp://www.audionautix.com/index.php?genre=Soundtrack
La Magie des Maths de Prépa - Bande Annonce Science4All (english) 2014-08-06 | Voici la bande annonce du documentaire sur la magie des mathématiques des classes préparatoires, à venir dans les mois prochains. Le documentaire sera composé de deux épisodes d'une heure chacun. Abonnez-vous pour ne pas le rater !Musique : Night Runner by Jason Shawhttp://audionautix.com/~audion/Music/NightRunner.mp3
