Richard Feynman — On the Incompleteness of Physical Laws @cyamahat

Uploaded February 2026 | Updated September 2026, 2 weeks ago

𝗥𝗶𝗰𝗵𝗮𝗿𝗱 𝗙𝗲𝘆𝗻𝗺𝗮𝗻 was invited to give the 𝟭𝟵𝟲𝟰 𝙈𝙚𝙨𝙨𝙚𝙣𝙜𝙚𝙧 𝙇𝙚𝙘𝙩𝙪𝙧𝙚𝙨 𝙖𝙩 𝘾𝙤𝙧𝙣𝙚𝙡𝙡 𝙐𝙣𝙞𝙫𝙚𝙧𝙨𝙞𝙩𝙮, an annual tradition since 1924, when Hiram Messenger gifted Cornell with "a fund to provide a course of lectures on the Evolution of Civilization for the special purpose of raising the moral standard of our political, business, and social life", to be "delivered by the ablest non-resident lecturer or lecturers obtainable".

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Richard Feynman — On the Incompleteness of Physical Laws

$Spectrometry, DIY Experiment & Laboratory Spectrometer | Observing Fraunhofer Lines and Fluorescence 🔬 Light Spectrum Experiments: DIY with Diffraction Grating & Spectrometer Analysis In this technical video, I demonstrate a simple DIY experiment using a holographic diffraction grating to observe Fraunhofer lines (solar absorption lines). The setup is followed by a series of measurements using an Ocean Optics USB2000 laboratory spectrometer. In addition to the solar spectrum, the video also explores fluorescence phenomena, using olive oil illuminated by a blue LED as an example. 📌 Keywords: diffraction grating, optics, spectrometer, Ocean Optics, USB2000 ▬▬ 🕒 Video Chapters: 00:00 – Experiment with holographic diffraction grating (visual observation of solar spectrum) 01:54 – Spectrometer measurements: Fraunhofer lines & fluorescence (olive oil + blue LED) 05:07 – Other technical videos on this YouTube channel ▬▬ 🔗 Useful Links (Spectrometry, Radiometry, and Photometry): • Holographic Diffraction Grating Film, Edmund Optics #54-510 — https://www.edmundoptics.com/f/holographic-diffraction-grating-film/11661/ • Schematic of the DIY Experiment Setup — https://i.imgur.com/QLZhsdH.png • Color, CIE diagram (notebooks, Observable platform) — https://observablehq.com/collection/@christophe-yamahata/colour • Human vision and the CIE chromaticity diagram (technical report, EN) — http://dx.doi.org/10.13140/RG.2.2.31371.30242 • The Geometry of Colours (video, EN) — https://www.youtube.com/watch?v=7KYwi2F5Ce4 • Broadband radiometric measurement of light-emitting diodes with a photodiode (white paper, EN) — http://dx.doi.org/10.13140/RG.2.2.34765.05600/2 • Fraunhofer Lines — https://en.wikipedia.org/wiki/Fraunhofer_lines / https://en.wikipedia.org/wiki/File:Solar_spectral_irradiance.svg • Why you cant take a good picture of a rainbow (video, Steve Mould) — https://www.youtube.com/watch?v=HauiF_AQUIY • Its a double rainbow all the way! (viral video, Yosemitebear) — https://www.youtube.com/watch?v=OQSNhk5ICTI No discussion about rainbows would be complete without mentioning the legendary viral video by Yosemitebear. It went viral for its genuine emotional reaction, paired with rather poor color reproduction.$

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