TED-Ed
History vs. Christopher Columbus - Alex Gendler
updated
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In the 1600s, Isaac Newton conducted a series of experiments to better understand the lights and colors that sometimes appear when your eyes are closed. If you’ve ever sat around an evening campfire or unintentionally glanced at the Sun, you may have noticed illuminated patterns briefly dance along your vision. So how do these visual illusions form? Paul Taylor explores the science of afterimages.
Lesson by Paul Taylor, directed by Sofia Pashaei.
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While his disciples loved their roguish leader, Sun Wukong’s misadventures had spread chaos throughout the land. The Jade Emperor, watching from his throne in Heaven, decided he would no longer stand by as this monkey wreaked havoc across his domain. The Emperor decided the best way to maintain order was to keep a close eye on Sun Wukong. Ji Hao follows the Monkey King's exploits in Heaven.
Lesson by Ji Hao, directed by Mohammad Babakoohi, Yijia Cao.
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Humans have known about the toxicity of death cap mushrooms for millennia. Yet they continue to pose a significant threat to unsuspecting foragers and mushroom hunters throughout the world. Today, death caps are responsible for more than 90% of all mushroom related deaths, killing upwards of 100 people each year. So, what makes this one species of mushroom so dangerous? Michael Beug investigates.
Lesson by Michael Beug, directed by Denys Spolitak.
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Born to a sea nymph and a king, and trained by the legendary centaur Chiron, Achilles was a demigod destined for greatness. When Greece declared war on Troy, Achilles knew the war was written into his destiny. With horses born from the west wind and a spear wrought from a mountain peak, he readied himself for battle. Iseult Gillespie tells the tale of the infamous warrior and his heel.
Lesson by Iseult Gillespie, directed by Luis Torres, Mr. Flama.
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Insects are the world’s most numerous and diverse animals. Even where you’d least expect them in some of Earth’s most extreme environments, there they are. From a scalding volcano, parched desert, to a frigid glacier, insects are living life on the edge. So, how do they do it? Charles Wallace illuminates the incredible survival skills of insects living in some of Earth's harshest ecosystems.
Lesson by Charles Wallace, directed by Raghav Arumugam, Jagriti Khirwar.
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Your granddaughter created a surprise for your birthday: a holographic map displaying everywhere you’ve traveled— not just on Earth, but through the universe. Considering you’re living on a spinning rock hurtling around a sun whizzing through a galaxy, you’ve made some real progress. But, how much, exactly? Fabio Pacucci and Lindsay DeMarchi explore how far you travel over the course of your life.
Lesson by Fabio Pacucci and Lindsay DeMarchi, directed by Vicente Numpaque, Hernando Bahamon, Globizco Studios.
This video made possible in collaboration with Brilliant
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In 1873, fishermen glimpsed what they thought was a shipwreck. But when they probed the mass, it moved— and huge, serpentine appendages soon besieged their boat. One fisherman took an axe to the animal, and it disappeared in a cloud of ink, leaving behind definitive evidence that giant squids were more than mythical monsters. So, what do we know about these creatures? Anna Rothschild investigates.
Lesson by Anna Rothschild, directed by Vitalii Nebelskyi, and action creative agency.
This video made possible in collaboration with OceanX Education. To learn more about the mysteries of the deep and educational opportunities with @OceanX, visit oceanx.org/education
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A special thanks to Mike Vecchion who provided information and insights for the development of this video.
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Do you ever feel tired? Overwhelmed? Depressed? Do you have headaches, dizziness, cramps, difficulty breathing? From 300 BCE to the 1900s, if you answered yes to any of these questions and you had a uterus, a doctor would likely diagnose you with hysteria. So, where did this medical diagnosis come from? And why did it persist for so long? Mark S. Micale traces the history of the catch-all term.
Lesson by Mark S. Micale, directed by Laura Jayne Hodkin.
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Thirteen billion years ago, the gas and dust particles that eventually became our Milky Way were whizzing around in every direction. Despite the wild motion of its parts, the galaxy as a whole was rotating about an axis. So why did the Milky Way, like most galaxies, become flat, and not spherical like stars and planets? Scott Hershberger explores the ever-evolving structure of our galaxy.
Lesson by Scott Hershberger, directed by Josh O'Caoimh, Mikai Geronimo.
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From incantations in ancient Egypt, bloodletting in 18th century Europe, to President Coolidge inhaling poisonous chlorine gas in 1924, the common cold has inspired a variety of creative treatments. Today pharmacies are filled with an endless assortment of cold remedies. But how do these products work? And are they effective? Explore the most common categories of cold medicines and their purposes.
Directed by Lippy.
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Between 2011 and 2022, the deadliest kitchen appliances in the US were ovens and ranges; taking lives by causing fires and leaking carbon monoxide. These kinds of sudden, catastrophic fatalities are thankfully rare. But the kitchen dangers that cause the most casualties may actually be less immediate, and more gradual. George Zaidan explores the safety of common kitchen appliances.
Lesson by George Zaidan, directed by Anastasiia Falileieva, Studio Plastic Bag.
This video made possible in collaboration with Speed & Scale
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For some animals, losing a limb is a decidedly permanent affair. But for salamanders, particularly axolotls, amputation is just a temporary affliction. Not only can they grow back entire limbs in as little as six weeks, they can also regenerate heart and even brain tissue. So, how does this astonishing adaptation work? Jessica Whited explores the incredible regenerative capacity of salamanders.
Lesson by Jessica Whited, directed by Anton Bogaty.
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In 1961, an Antarctic expedition took a harrowing turn: Dr. Leonid Rogozov began feeling feverish, with an excruciating pain in his right side. It soon became clear that he had appendicitis. While Rogozov’s predicament was extreme, appendicitis is not uncommon; affecting roughly one in 12 people. So, what causes appendicitis? And why is this organ so prone to bursting? David R. Flum investigates.
Lesson by David R. Flum, directed by Igor Ćorić, Artrake Studio.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski, Noah Webb, Roberto Chena, Oliver Koo, Luke Pisano, Andrea Gordon, Aleksandar Donev, Nicole Klau Ibarra, Jesse Lira, Ezekiel Raui, Petr Vacek, Dennis, Olivia Fu, Kari Teffeau, Cindy Lai, Rajath Durgada Manjunath, Dan Nguyen, Chin Beng Tan, Tom Boman, Karen Warner, Iryna Panasiuk, Aaron Torres, Eric Braun, Sonja Worzewski, Michael Clement, Adam Berry, Ghaith Tarawneh, Nathan Milford, Tomas Beckett, Alice Ice, Eric Berman, Kurt Paolo Sevillano, Jennifer Heald, Megulo Abebe, isolwi, Kate Sem, Ujjwal Dasu, Angel Alberici, Minh Quan Dinh, Sylvain, Terran Gimpel, Talia Sari, Katie McDowell, Allen, Mahina Knuckles, Charmaine Hanson and Thawsitt.
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Zebras belong to the same equine family as horses and donkeys. After their lineage entered Africa, they evolved into three zebra species, lived in social herds, grazed on grasses, and evaded fierce predators. One mystery that has perplexed prominent scientists for decades is the matter of their coats: why are they striped? Cella Wright digs into the common theories about the unique patterning.
Lesson by Cella Wright, directed by Sharon Colman.
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Imagine a scientist who has teleported to space. His spacesuit’s pressurized air protects his bodily fluids from vaporization, its oxygen tank keeps him breathing, and the insulation prevents him from freezing. But although these features thwart an immediate tragedy, space is still an incredibly dangerous place. So, what does a prolonged stay in space do to the human body? Tejal Gala investigates.
Lesson by Tejal Gala, directed by Henrique Barone.
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Shock seized the West African Dagara village as word travelled of a new decree. Completely disregarding time-honored naming rituals, the tyrannical chief declared that he alone would name the village’s children. But soon an unlikely challenger appeared: Yagangnaa, the boy who named himself. Paschal Kyiiripuo Kyoore shares the tale of the defiant boy and his battle of wits with the chief.
Lesson by Paschal Kyiiripuo Kyoore, directed by Lesego Vorster, The Hidden Hand Studios.
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Laocoön, a seer and priest, was deeply suspicious of the enormous wooden horse that the Greeks left in Troy and cautioned the Trojans not to accept this strange offering. But their fate was already sealed — the gods granted the Greeks victory and punished the priest for threatening their success. Noah Charney explores how Laocoön’s tragic tale inspired countless artists across the ancient world.
Lesson by Noah Charney, directed by Michael Kalopaidis, Zedem Media.
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Whales frequently surface to take in air and let out massive plumes of waste. And while this slurry might seem disgusting, whale poop is much more desirable than it may seem. In fact, it may be one of the most important substances in the ocean — and the world. So, what makes whale poop so vital to our ecosystems? David Biello shares the surprising benefits of whale excrement.
Lesson by David Biello, directed by Joseph Clark, Oh Studio.
This video made possible in collaboration with Speed & Scale
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By 1975, Richard Davis had been shot at close range 192 times. But not only was he completely healthy, each of those bullets were part of a demonstration to sell his new product: the bulletproof vest. So, how does such a light, flexible piece of clothing stop a bullet? The secret was a synthetic fiber material invented a decade earlier. Max G. Levy explores the incredible strength of kevlar.
Lesson by Max G. Levy, directed by Vitalii Nebelskyi, and action creative agency.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Michel-Ange Hortegat, Enes Kirimi, Amaury BISIAUX, ND, Samyogita Hardikar, Vanessa Graulich, Vandana Gunwani, Abdulmohsin Almadi, AJ Lyon, Geoffrey Bultitude, Mi Mi, Thomas Rothert, Brian Elieson, Oge O, Weronika Falkowska, Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski, Noah Webb, Roberto Chena, Oliver Koo, Luke Pisano, Andrea Gordon, Aleksandar Donev, Nicole Klau Ibarra, Jesse Lira, Ezekiel Raui, Petr Vacek, Dennis, Olivia Fu, Kari Teffeau, Cindy Lai, Rajath Durgada Manjunath, Dan Nguyen, Chin Beng Tan, Tom Boman, Karen Warner, Iryna Panasiuk, Aaron Torres, Eric Braun, Sonja Worzewski, Michael Clement, Adam Berry, Ghaith Tarawneh, Nathan Milford, Tomas Beckett, Alice Ice, Eric Berman and Kurt Paolo Sevillano.
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In the 5th century, a ship master was suffering from a nasty infection that caused his jaws to press together, his teeth to lock up, and the muscles in his neck and spine to spasm. Today we know this account to be one the first recorded cases of tetanus. So, what causes this peculiar infection? Louise Thwaites explores how tetanus affects our bodies, and how we can prevent it.
Lesson by Louise Thwaites, directed by Andrew Foerster, Rewfoe.
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Thank you so much to our patrons for your support! Without you this video would not be possible! OnlineBookClub.org, Eric Shear, Leith Salem, Omar Hicham, Adrian Rotaru, Brad Sullivan, Karen Ho, Niklas Frimberger, Hunter Manhart, Nathan Nguyen, Igor Stavchanskiy, James R DeVries, Grace Huo, Diana Huang, Chau Hong Diem, Orlellys Torre, Corheu, Thomas Mee, Maryann H McCrory, Blas Borde, John Hellmann, Poompak Meephian, Chuck Wofford, Adam Pagan, Wes Winn, Conder Shou, ntiger, Noname, Hansan Hu, David D, Mac Hyney, Keith Ellison, robin valero walters, Lynne Truesdale, Gatsby Dkdc, Matthew Neal, Denis Chon, Julian Oberhofer, Monte Carroll, Eddy, Jay M, Constantino Victor Delgado, Andrea Galvagni, Andrew Tweddle, Laurel-Ann Rice, Fernando A. Endo, Helen Lee, pam morgan, sarim haq and Gerardo Castro.
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Throughout history, people have attributed warts to contact with things like sea foam, boiled egg water, and, of course, toads. Fortunately, we now know that warts are not caused by toads, but are actually caused by human papillomaviruses, or HPVs. So, how exactly do HPVs lead to warts? And what should you do if you get one? Cella Wright explores the science of these bumpy skin growths.
Lesson by Cella Wright, directed by Anton Bogaty.
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Within the periodic table loom many potential hazardous elements. Some elements are dangerous due to their toxicity. Others are dangerous because of how they respond, react, or even explode in the outside environment. And perhaps the most threatening elements are those that silently emit energy. So, which substances on the periodic table are the most dangerous? Shannon Odell investigates.
Lesson by Shannon Odell, directed by Anton Bogaty.
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Wigs date at least as far back as ancient Egypt, where well-regarded hairdressers crafted them into intricate styles. And under certain ancient Roman dynasties, women’s wigs became particularly ornate. Yet it wasn’t until Louis XIII unveiled a magnificent mane in the 17th century that big wigs truly began booming. Stephanie Honchell Smith details the rise and fall of the bewigged fashion craze.
Lesson by Stephanie Honchell Smith, directed by Patrick Smith.
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Around the world, millions of people have Alzheimer’s disease, a debilitating brain disorder that gradually destroys a person’s memory and other cognitive abilities. While doctors have studied Alzheimer’s for decades, conducting hundreds of clinical trials, there is still no effective preventive treatment or cure. So, why is Alzheimer’s disease so difficult to treat? Krishna Sudhir investigates.
Lesson by Krishna Sudhir, directed by Rowena Sheehan.
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Throughout the 1980s, oil industry reps discussed the dangers of burning fossil fuels, acknowledging the risk their product posed to the future of humanity. However, instead of warning the public or pivoting towards renewable energy sources, they doubled down on oil — and launched a decades-long campaign to discredit climate change science. Stephanie Honchell Smith digs into Big Oil's tactics.
Lesson by Stephanie Honchell Smith, directed by Sofia Pashaei.
This video made possible in collaboration with Speed & Scale
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Data and graph shown at 5:43 by Statista: statista.com/chart/11673/the-soaring-costs-of-climate-change
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It's something we've all experienced: the back of your elbow smacks against a hard surface and the impact sends a sensation so distinctly disquieting shooting down your arm that it takes several moments to regain composure. So, why does hitting this spot on your elbow— commonly known as the funny bone— feel so weird? Cella Wright explains one of the most complicated joints in the body.
Lesson by Cella Wright, directed by Anton Bogaty.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Matthew Neal, Denis Chon, Julian Oberhofer, Monte Carroll, Eddy, Jay M, Constantino Victor Delgado, Andrea Galvagni, Andrew Tweddle, Laurel-Ann Rice, Fernando A. Endo, Helen Lee, pam morgan, sarim haq, Gerardo Castro, Michel-Ange Hortegat, Enes Kirimi, Amaury BISIAUX, ND, Samyogita Hardikar, Vanessa Graulich, Vandana Gunwani, Abdulmohsin Almadi, AJ Lyon, Geoffrey Bultitude, Mi Mi, Thomas Rothert, Brian Elieson, Oge O, Weronika Falkowska, Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski, Noah Webb, Roberto Chena, Oliver Koo, Luke Pisano, Andrea Gordon, Aleksandar Donev, Nicole Klau Ibarra, Jesse Lira, Ezekiel Raui, Petr Vacek, Dennis, Olivia Fu, Kari Teffeau, Cindy Lai, Rajath Durgada Manjunath and Dan Nguyen.
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Astronauts aboard the space station Mir made a frightening discovery: several species of Earth-derived fungi were found growing throughout the shuttle, blanketing air conditioners and corroding control panels, putting both the station’s integrity and their lives at risk. How had the fungi survived the journey to space? Shannon Odell shares why fungi may be the key to our future on other planets.
Lesson by Shannon Odell, directed by Denys Spolitak.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Khalifa Alhulail, Martin Stephen, Jose Henrique Leopoldo e Silva, Mandeep Singh, Abhijit Kiran Valluri, Morgan Williams, Devin Harris, Pavel Zalevskiy, Karen Goepen-Wee, Filip Dabrowski, Barbara Smalley, Megan Douglas, Tim Leistikow, Ka-Hei Law, Hiroshi Uchiyama, Mark Morris, Misaki Sato, EdoKun, SookKwan Loong, Bev Millar, Lex Azevedo, Michael Aquilina, Jason A Saslow, Yansong Li, Cristóbal Moenne, Dawn Jordan, Prasanth Mathialagan, Samuel Doerle, David Rosario, Dominik Kugelmann - they-them, Siamak Hajizadeh, Ryohky Araya, Mayank Kaul, Christophe Dessalles, Heather Slater, Sandra Tersluisen, Zhexi Shan, Bárbara Nazaré, Andrea Feliz, Victor E Karhel, Sydney Evans, Latora, Noel Situ, emily lam, Sid, Niccolò Frassetto, Mana, I'm here because of Knowledge Fight Facebook group, Linda Freedman and Edgardo Cuellar.
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An alligator snapping turtle lures its prey using a blood-engorged tongue that resembles a wriggling worm. And it’s far from the only animal doing tongue trickery. Tongues in the animal kingdom vary widely — from texture and length, to shape and dexterity. So, what's the point of having so many different kinds of tongues? Cella Wright explores how different species use the appendage to survive.
Lesson by Cella Wright, directed by Igor Ćorić, Artrake Studio.
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When Cadmus walked the Earth, just a few generations separated him from his divine ancestors. From atop Mount Olympus, they scrutinized and meddled with mortals like himself. Cadmus was a skilled warrior and heir to the Phoenician throne, but he wouldn’t stay in the gods’ favor for long— a critical mistake would seal his tragic fate. Iseult Gillespie details the Greek myth of the serpent’s curse.
Lesson by Iseult Gillespie, directed by Adriana Monteforte Lahera.
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Recent studies found that elite runners can take in twice as much oxygen as non-runners. And it’s likely that this superhuman ability played a role in breaking the two-hour marathon barrier in 2019. But when it comes to breathing efficiently, not even the best runners can compete with the average fish. What makes fish some of the best breathers on Earth? Dan Kwartler explores the science of gills.
Lesson by Dan Kwartler, directed by Denys Spolitak.
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Globally, around 23 million pregnancies end in miscarriage each year. Despite how common it is, miscarriage can still feel isolating, and for some, emotionally traumatizing. And myths about miscarriage add to the stigma, leading many to blame themselves for the loss. So what happens in the body during miscarriage? Nassim Assefi & Emily M. Godfrey take a closer look at pregnancy loss and treatment.
Lesson by Nassim Assefi and Emily M. Godfrey, directed by Lené van Heerden, We Are Batch TV.
A special thanks to the World Health Organization who provided information and insights for the development of this video.
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Thank you so much to our patrons for your support! Without you this video would not be possible! John Hellmann, Poompak Meephian, Chuck Wofford, Adam Pagan, Wes Winn, Conder Shou, ntiger, Noname, Hansan Hu, David D, Mac Hyney, Keith Ellison, robin valero walters, Lynne Truesdale, Gatsby Dkdc, Matthew Neal, Denis Chon, Julian Oberhofer, Monte Carroll, Eddy, Jay M, Constantino Victor Delgado, Andrea Galvagni, Andrew Tweddle, Laurel-Ann Rice, Fernando A. Endo, Helen Lee, pam morgan, sarim haq, Gerardo Castro, Michel-Ange Hortegat, Enes Kirimi, Amaury BISIAUX, ND, Samyogita Hardikar, Vanessa Graulich, Vandana Gunwani, Abdulmohsin Almadi, AJ Lyon, Geoffrey Bultitude, Mi Mi, Thomas Rothert, Brian Elieson, Oge O, Weronika Falkowska, Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski and Noah Webb.
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Stars have cores hot and dense enough to force atomic nuclei together, forming larger, heavier nuclei in a process known as fusion. In this process, the mass of the end products is slightly less than the mass of the initial atoms. But that “lost” mass doesn’t disappear — it’s converted to energy ... a lot of energy. So, can we harness this energy to power the world? George Zaidan investigates.
Lesson by George Zaidan, directed by Igor Ćorić, Artrake Studio.
This video made possible in collaboration with Speed & Scale
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Thank you so much to our patrons for your support! Without you this video would not be possible! Sandra Tersluisen, Zhexi Shan, Bárbara Nazaré, Andrea Feliz, Victor E Karhel, Sydney Evans, Latora, Noel Situ, emily lam, Sid, Niccolò Frassetto, Mana, I'm here because of Knowledge Fight Facebook group., Linda Freedman, Edgardo Cuellar, Jaspar Carmichael-Jack, Michael Burton, VIVIANA A GARCIA BESNE, The Vernon's, Olha Bahatiuk, Jesús Bíquez Talayero, Chels Raknrl, Sai Pranavi Jonnalagadda, Stuart Rice, Jing Chen, Vector-Dopamine math, Jasper Song, Giorgio Bugnatelli, Chardon, Eddy Trochez, OnlineBookClub.org, Eric Shear, Leith Salem, Omar Hicham, Adrian Rotaru, Brad Sullivan, Karen Ho, Niklas Frimberger, Hunter Manhart, Nathan Nguyen, Igor Stavchanskiy, James R DeVries, Grace Huo, Diana Huang, Chau Hong Diem, Orlellys Torre, Corheu, Thomas Mee, Maryann H McCrory and Blas Borde.
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Each year, approximately 20 million people receive a cancer diagnosis. At that time, a patient usually learns their cancer’s stage, which is typically a number ranging from one to four. While staging is designed, in part, to help patients better understand what they’re facing, the number can be confusing. So, what do cancer stages actually mean? Hyunsoo Joshua No and Trudy Wu explain.
Lesson by Hyunsoo Joshua No and Trudy Wu, directed by Jess Mountfield.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Doreen Reynolds-Consolati, Manognya Chakrapani, Ayala Ron, Eunsun Kim, Phyllis Dubrow, Ophelia Gibson Best, Paul Schneider, Joichiro Yamada, Henrique Cassús, Karthik Cherala, Clarence E. Harper Jr., Vignan Velivela, Ana Maria, Exal Enrique Cisneros Tuch, Tejas Dc, Khalifa Alhulail, Martin Stephen, Jose Henrique Leopoldo e Silva, Mandeep Singh, Abhijit Kiran Valluri, Morgan Williams, Devin Harris, Pavel Zalevskiy, Karen Goepen-Wee, Filip Dabrowski, Barbara Smalley, Megan Douglas, Tim Leistikow, Ka-Hei Law, Hiroshi Uchiyama, Mark Morris, Misaki Sato, EdoKun, SookKwan Loong, Bev Millar, Lex Azevedo, Michael Aquilina, Jason A Saslow, Yansong Li, Cristóbal Moenne, Dawn Jordan, Prasanth Mathialagan, Samuel Doerle, David Rosario, Dominik Kugelmann - they-them, Siamak Hajizadeh, Ryohky Araya, Mayank Kaul, Christophe Dessalles and Heather Slater.
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According to legend, in the 27th century BCE, the Yellow Emperor of China charged his historian, Cangjie, to develop a system of writing. Sitting alongside a riverbank, Cangjie noted the imagery that surrounded him. From this, he created the first Chinese characters. So, how has Chinese evolved in the last 3,000 years? Gina Marie Elia explores the history of one of the earliest written languages.
Lesson by Gina Marie Elia, directed by PeiHsin Cho.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Jose Arcadio Valdes Franco, Sebastiaan Vleugels, Karl Laius, JY Kang, Abhishek Goel, Heidi Stolt, Nicole Sund, Karlee Finch, Mario Mejia, Denise A Pitts, Doug Henry, Keven Webb, Mihai Sandu, Deepak Iyer, Javid Gozalov, Kyanta Yap, Rebecca Reineke, William Biersdorf, Patricia Alves Panagides, Yvette Mocete, Cyrus Garay, Samuel Barbas, LadyGeek, Marin Kovachev, Penelope Misquitta, Hans Peng, Gaurav Mathur, Erik Biemans, Tony, Michelle, Katie and Josh Pedretti, Hoai Nam Tran, Kack-Kyun Kim, Michael Braun-Boghos, zjweele13, Anna-Pitschna Kunz, Edla Paniguel, Thomas Mungavan, Jaron Blackburn, Venkat Venkatakrishnan, ReuniteKorea, Aaron Henson, Rohan Gupta, Begum Tutuncu, Brian Richards, Jørgen Østerpart, Tyron Jung, Carsten Tobehn, Katie Dean, Ezgi Yersu, Gerald Onyango and alessandra tasso.
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When Queen Jocasta of Thebes gave birth to Oedipus, a grim air seized the occasion. Her husband, King Laius, had received a prophecy from Apollo's oracle foretelling that he would die at the hands of his own son. Determined to escape this fate, Laius abandoned the newborn on Mount Cithaeron. But divine prophecies can be quite stubborn. Stephen Esposito shares the tragic Greek tale of Oedipus.
Lesson by Stephen Esposito, directed by Yael Reisfeld.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Angel Alberici, Minh Quan Dinh, Sylvain, Terran Gimpel, Talia Sari, Katie McDowell, Allen, Mahina Knuckles, Charmaine Hanson, Thawsitt, Jezabel, Abdullah Abdulaziz, Xiao Yu, Melissa Suarez, Brian A. Dunn, Francisco Amaya, Daisuke Goto, Matt Switzler, Peng, Tzu-Hsiang, Bethany Connor, Jeremy Shimanek, Mark Byers, Avinash Amarnath, Xuebicoco, Rayo, Po Foon Kwong, Boffin, Jesse Jurman, Scott Markley, Elija Peterson, Ovidiu Mrd, paul g mohney, Steven Razey, Nathan Giusti, Helen Lee, Anthony Benedict, Karthik Balsubramanian, Annastasshia Ames, Amy Lopez, Vinh-Thuy Nguyen, Liz Candee, Ugur Doga Sezgin, Karmi Nguyen, John C. Vesey, Yelena Baykova, Nick Johnson, Carlos H. Costa, Jennifer Kurkoski, Ryan B Harvey and Akinola Emmanuel.
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You’ve spent months creating a basketball-playing robot, the Dunk-O-Matic, and you’re excited to demonstrate its capabilities. Until you read an advertisement: “See the Dunk-O-Matic face human players and automatically adjust its skill to create a fair game for every opponent!” That’s not what you were told to create. Can you recalibrate your robot to make it a fair match? Dan Katz shows how.
Lesson by Dan Katz, directed by Igor Ćorić, Artrake Studio.
This video made possible in collaboration with Brilliant
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Thank you so much to our patrons for your support! Without you this video would not be possible! Vanessa Graulich, Vandana Gunwani, Abdulmohsin Almadi, AJ Lyon, Geoffrey Bultitude, Mi Mi, Thomas Rothert, Brian Elieson, Oge O, Weronika Falkowska, Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski, Noah Webb, Roberto Chena, Oliver Koo, Luke Pisano, Andrea Gordon, Aleksandar Donev, Nicole Klau Ibarra, Jesse Lira, Ezekiel Raui, Petr Vacek, Dennis, Olivia Fu, Kari Teffeau, Cindy Lai, Rajath Durgada Manjunath, Dan Nguyen, Chin Beng Tan, Tom Boman, Karen Warner, Iryna Panasiuk, Aaron Torres, Eric Braun, Sonja Worzewski, Michael Clement, Adam Berry, Ghaith Tarawneh, Nathan Milford, Tomas Beckett, Alice Ice, Eric Berman, Kurt Paolo Sevillano, Jennifer Heald, Megulo Abebe, isolwi, Kate Sem and Ujjwal Dasu.
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The world is always abuzz with sounds, many of which human ears simply can’t hear. However, other species have extraordinary adaptations that grant them access to realms of sonic extremes. And some of them don’t even have ears— at least, not like we typically imagine. So, which is the best listener? Jakob Christensen-Dalsgaard explores the auditory capabilities of the animal kingdom.
Lesson by Jakob Christensen-Dalsgaard, directed by Joseph Clark.
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According to legend, the renowned scholar Jalaluddin Muhammad Rumi was giving a lecture when a disheveled man approached and asked him the meaning of his academic books. Rumi didn’t know it yet, but this question and this man would change his life. So, who was this mysterious figure, and how did he influence Rumi’s worldview? Stephanie Honchell Smith details the life of the celebrated poet.
Lesson by Stephanie Honchell Smith, directed by Reza Riahi.
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In 1970, neurosurgeon Robert White and his team carted two monkeys into an operating room to conduct an ambitious experiment. The objective was to connect the head of Monkey A to the body of Monkey B, in what he considered a whole-body transplant, with the ultimate goal of one day performing this surgery on humans. Is such a feat even medically possible? And is it ethical? Max G. Levy investigates.
Lesson by Max G. Levy, directed by Anton Bogaty.
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Ice cream has a unique role in our world’s history, culture, and cravings. The first accounts of cold desserts date back to the first century, in civilizations including ancient Rome, Mughal India, and Tang Dynasty China. Yet the cream-based delicacy we know today made a much later debut. So, how did the delicious sweet treat come to be? Vivian Jiang shares the scoop on the history of ice cream.
Lesson by Vivian Jiang, directed by Masayoshi Nakamura, Good General.
Music and sound design by Zak Engel.
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Typically, with any piece of technology, you pump one unit of energy in and you get about one out. That’s just the first law of thermodynamics: energy has to be conserved. But there’s a piece of technology called a heat pump, where for every bit of energy you put in, you get three to five times as much heat out. What wizardry is this? Anna Rothschild investigates the science of heat pumps.
Lesson by Anna Rothschild, directed by Kevin Herrmann, AIM Creative Studios.
This video made possible in collaboration with Speed & Scale
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Spelling reformers have been advocating for changes to make English spelling more intuitive and less irregular. One example of its messiness: take the “g-h” sound from “enough,” the “o” sound from “women” and the “t-i” sound from “action,” and you could argue that “g-h-o-t-i” spells “fish.” So, how did English get like this? Arika Okrent explores the complexity of English spelling conventions.
Lesson by Arika Okrent, directed by Emily Howells, Aaron Brady.
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A couple has been considering getting engaged, but they’re worried about divorce statistics. An AI-based model was just released that can predict your likelihood of divorce with 95% accuracy. The only catch is the model doesn’t offer any reasons for its results. So, should they decide whether or not to get married based on this AI’s prediction? Thomas Hofweber explores AI’s transparency problem.
Lesson by Thomas Hofweber, directed by Hannah Lau-Walker.
This video was produced in collaboration with the Parr Center for Ethics, housed within the renowned Philosophy Department at the University of North Carolina at Chapel Hill. The Parr Center is committed to integrating abstract work in ethical theory with the informed discussion of practical ethical issues, and prides itself on the development of innovative and inclusive approaches to moral and civic education.
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Under certain conditions, the idea of a dictator can sound appealing, like when a democracy isn’t functioning as it should due to corruption or political polarization. People may believe the solution is a "benevolent dictator"— a leader who only uses their absolute power for the common good. But can such a leader actually exist in today’s world? Stephanie Honchell Smith examines this common myth.
Lesson by Stephanie Honchell Smith, directed by Avi Ofer.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Morgan Williams, Devin Harris, Pavel Zalevskiy, Karen Goepen-Wee, Filip Dabrowski, Barbara Smalley, Megan Douglas, Tim Leistikow, Ka-Hei Law, Hiroshi Uchiyama, Mark Morris, Misaki Sato, EdoKun, SookKwan Loong, Bev Millar, Lex Azevedo, Michael Aquilina, Jason A Saslow, Yansong Li, Cristóbal Moenne, Dawn Jordan, Prasanth Mathialagan, Samuel Doerle, David Rosario, Dominik Kugelmann - they-them, Siamak Hajizadeh, Ryohky Araya, Mayank Kaul, Christophe Dessalles, Heather Slater, Sandra Tersluisen, Zhexi Shan, Bárbara Nazaré, Andrea Feliz, Victor E Karhel, Sydney Evans, Latora, Noel Situ, emily lam, Sid, Niccolò Frassetto, Mana, I'm here because of Knowledge Fight Facebook group., Linda Freedman, Edgardo Cuellar, Jaspar Carmichael-Jack, Michael Burton, VIVIANA A GARCIA BESNE, The Vernons and Olha Bahatiuk.
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In the millions of years since oxygen began saturating Earth’s oceans and atmosphere, most organisms have evolved to rely on this gas. However, there are some places where oxygen-averse microorganisms like those from Earth’s earliest days have re-emerged. And one such place is hidden high in the Swiss Alp’s Piora Valley. Nicola Storelli and Daniele Zanzi dive into the depths of Lake Cadagno.
Lesson by Nicola Storelli and Daniele Zanzi, directed by Ivana Volda, Thomas Johnson Volda.
A special thanks to Francesco Di Nezio, Bruno Giussani, Raffaele Peduzzi, Sandro Peduzzi, Samuele Roman, and Mauro Tonolla who provided information and insights for the development of this video.
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Philosopher Hannah Arendt was a German Jew who dedicated herself to understanding how the Nazi regime came to power, and more specifically, how it inspired so many atrocities. She believed the true conditions behind the unprecedented rise of totalitarianism weren’t specific to Germany, and developed theories on how to best combat such threats. Joseph Lacey explores the work of Hannah Arendt.
Lesson by Joseph Lacey, directed by Sarah Saidan.
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For most of the world’s 4,000 mayfly species, adulthood lasts roughly one day. And for some species, it’s only a matter of minutes. This isn’t because they’re all eaten up by predators. Rather, this abridged adulthood is a natural part of their life cycle. So, what role do these bugs play in their ecosystems? Luke M. Jacobus explores the stunningly short life span of the winged insects.
Lesson by Luke M. Jacobus, directed by Denys Spolitak.
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Many people would say the connection between happiness and gratefulness is very simple: when you are happy, you are grateful. But think again. Is it really the happy people that are grateful? Quite a number of people have everything that it would take to be happy, and they are not happy. So, how does gratefulness work? Explore the key components to living gratefully.
Directed by Avi Ofer.
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Thank you so much to our patrons for your support! Without you this video would not be possible! Conder Shou, ntiger, Noname, Hansan Hu, David D, Mac Hyney, Keith Ellison, robin valero walters, Lynne Truesdale, Gatsby Dkdc, Matthew Neal, Denis Chon, Julian Oberhofer, Monte Carroll, Eddy, Jay M, Constantino Victor Delgado, Andrea Galvagni, Andrew Tweddle, Laurel-Ann Rice, Fernando A. Endo, Helen Lee, pam morgan, sarim haq, Gerardo Castro, Michel-Ange Hortegat, Enes Kirimi, Amaury BISIAUX, ND, Samyogita Hardikar, Vanessa Graulich, Vandana Gunwani, Abdulmohsin Almadi, AJ Lyon, Geoffrey Bultitude, Mi Mi, Thomas Rothert, Brian Elieson, Oge O, Weronika Falkowska, Nevin Spoljaric, Sid Chanpuriya, Anoop Varghese, David Yastremski, Noah Webb, Roberto Chena, Oliver Koo, Luke Pisano, Andrea Gordon and Aleksandar Donev.
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You might think of gas masks as clunky military-looking devices. But in the near future, we may need to rely on these filters as part of our everyday lives. In addition to emerging diseases, wildfire frequency has more than tripled, and climate change has increased toxic ground level ozone. So how do these masks work, and can they protect us from airborne threats? George Zaidan investigates.
Lesson by George Zaidan, directed by Michael Kalopaidis, Zedem Media.
This video made possible in collaboration with Speed & Scale
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During the 8th century CE, warfare and failing agriculture forced Maya people to move north, to hotter, drier Yucatán. Because of its freshwater access, Chichen Itza became the most powerful Maya city, with nearly 50,000 citizens at its height. But the region presented its own challenges and the city's golden age wouldn’t last forever. Geoffrey E. Braswell traces the city's rise and fall.
Lesson by Geoffrey E. Braswell, directed by Hernando Bahamon, Globizco Studios.
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View full lesson: ed.ted.com/lessons/the-rise-and-fall-of-the-maya-empire-s-most-powerful-city-geoffrey-e-braswell
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