סרטונים מובילים
Key aspects of pyramid construction from quarry to completion.
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The most common misconception about the pyramids is that they were built by slaves. Recent archeological evidence suggests they were instead constructed by paid workers. Some may have performed this work as a form of tax payment for several months of the year. Skilled engineers would have planned and orchestrated the building. An estimated 10,000-20,000 people would have been working on a pyramid at any one point in time. They were well fed and provided with shelter near the pyramids. Plus their burial sites close by indicate they were respected and were not slaves.
Much of the limestone was quarried from the Giza plateau itself, meaning the stones did not need to be transported far. The granite casing of Menkaure's pyramid, on the other hand, was transported from Aswan, around 600 miles, or 1000 km up the Nile.
Editing assistance by Dustin Chow
Music by Kevin MacLeod, Incompetech.com "Desert City" and "Ibn Al-Noor"
Droplets levitate on a bath of liquid nitrogen and are spontaneously self-propelled. Thanks Audible! Start a 30-day trial and your first audiobook is free. Go to https://audible.com/VERITASIUM or text VERITASIUM to 500500.
Special thanks to Dr. Anaïs Gauthier
Physics of Fluids: https://pof.tnw.utwente.nl/
Self-propulsion of inverse Leidenfrost drops on a cryogenic bath
Anaïs Gauthier, Christian Diddens, Rémi Proville, Detlef Lohse, and Devaraj van der Meer
PNAS January 22, 2019 116 (4) 1174-1179; published ahead of print January 22, 2019
https://www.pnas.org/content/116/4/1174
For a detailed description of the setup:
http://www.lps.ens.fr/~adda/pa....piers/Langmuir2016.p
And self-propulsion is also seen: http://www.lps.ens.fr/~adda/pa....piers/InvLeidenfrost
Other recent (hot) Leidenfrost experiments that might be interesting:
* Leidenfrost wheels: https://www.youtube.com/watch?v=glRGl-eYuXo
* Leidenfrost maze: https://www.youtube.com/watch?time_continue=174&v=vPZ7sx3EwUY
* Leidenfrost explosions: https://www.youtube.com/watch?v=z0sp3AjgUy4
Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd
Thanks to Prof. Kevin McKeegan at UCLA for the liquid nitrogen
Filming by Raquel Nuno
Additional animations by Alan Chamberlain
A rare look inside the Svalbard Global Seed Vault which is closed ~350 days a year
Check out Audible: http://bit.ly/AudibleVe
More info on the seed vault: http://wke.lt/w/s/EKFlK
My trip to Norway was funded by Screen Australia, Film Victoria and Genepool Productions as part of a new project. More information soon.
Special thanks to Bente Naeverdal and the Crop Trust: https://www.croptrust.org
A recent survey of scientific literacy in Australia found 30% believe it takes one day for the Earth to go around the sun. This video provides qualitative evidence for the finding from Sydney's Eastern beaches.
I always wanted to know why film looked better than video. Moving electronic images have as long a history but were invented for a different purpose. This video was sponsored by B&H Photo: https://www.bhphotovideo.com
Huge thanks to:
Richard Diehl, Video Labguy https://www.youtube.com/user/videolabguy
https://www.labguysworld.com
Branch Education for awesome animations
https://ve42.co/BranchEd
Minutephysics for mechanical TV animations
https://www.youtube.com/minutephysics
Mark Schubin
Engineer and explainer, SMPTE Life Fellow
https://www.smpte.org
This is a video I've long wanted to make, about what makes video look like video and, up until 10 years ago or so, not as appealing as film. I grew up with the two technologies (film and video) in parallel and to me they always seemed like two ways of achieving the same ends: recording and replaying moving images. But their histories are quite distinct. Film was always a way to capture moving images for later replaying. Video started out as a way to transfer images from one place to another instantaneously. This dates back to the first fax machine, mechanical TV, live broadcast tv and ultimately videotapes. This history focuses on the early decades of video and not the more recent switches to chip cameras and solid state storage. Maybe that's a story for another day.
Additional resources and references:
The Dawn of Tape: Transmission Device as Preservation Medium
https://ve42.co/dawnoftape
What Sparked Video Research in 1877? The Overlooked Role of the Siemens Artificial Eye
https://ve42.co/sparkvideo
Video Preservation Website:
http://videopreservation.conservation-us.org
Image Orthicon Tube:
http://interiorcommunicationse....lectrician.tpub.com/
Film vs Digital
https://stephenfollows.com/film-vs-digital/
Eyes of a Generation:
http://eyesofageneration.com
Television in the US:
http://www3.northern.edu/wild/th100/tv.htm
http://www.classictvinfo.com
Music from https://www.epidemicsound.com "Seaweed" "Capture a Picture 1" "Colorful Animation 4"
How does Japan prepare for its devastating earthquakes? With this giant simulator. For a free trial to Shopify go to https://www.shopify.com/veritasium.
If you’re looking for a molecular modeling kit, head to https://ve42.co/SnatomsV to try Snatoms – a kit I invented where the atoms snap together magnetically.
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A massive thank you to everyone at NIED for allowing access to their facility. Massive thanks to Okouchi-san for arranging this shoot.
A huge thank you to Dr. Yohsuke Kawamata for the tour of E-defense and for sharing his deep expertise.
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References:
Nakashima, M., et al. (2018). Experiences, accomplishments, lessons, and challenges of E‐defense. Tests using world's largest shaking table. Japan Architectural Review, 1(1), 4-17. - https://ve42.co/Nakashima
Suganuma, K. (2005). 3-D Full-Scale Earthquake Testing Facility (E-Defense). NISTEP Science & Technology Foresight Center. - https://ve42.co/Suganuma
Ohtani, K., et al. (2004). Construction of E-Defense (3-D full-scale earthquake testing facility). In Thirteenth World Conference on Earthquake Engineering (Vol. 189). - https://ve42.co/Ohtani
Horiuchi, T., et al. (2022). Contributions of E-Defense Shaking Table to Earthquake Engineering and its Future. Journal of Disaster Research, 17(6), 985-999. - https://ve42.co/Horiuchi
Nakamura, I., et al. (2008). E-Defense experiments on full-scale wooden houses. In Proceedings of the 14th World conference on earthquake engineering, Beijing, China (pp. 12-17). - https://ve42.co/Nakamura
Japan: The Next Big Quake. Financial Times. - https://ve42.co/BigQuake
Images & Video:
Kobe earthquake compilation - https://ve42.co/Kobe
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Special thanks to our Patreon supporters:
carrotcypher, Chris Harper, Max Paladino, Balkrishna Heroor, Adam Foreman, Orlando Bassotto, Tj Steyn, meg noah, KeyWestr, TTST, John H. Austin, Jr., john kiehl, Anton Ragin, Diffbot, Gnare, Dave Kircher, Burt Humburg, Blake Byers, Evgeny Skvortsov, Meekay, Bill Linder, Paul Peijzel, Josh Hibschman, Juan Benet, David Johnston, Ubiquity Ventures, Richard Sundvall, Lee Redden, Stephen Wilcox, Marinus Kuivenhoven, Michael Krugman, Sam Lutfi.
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Directed by Will Wood and Petr Lebedev
Written by Will Wood, Petr Lebedev and Derek Muller
Edited by Jack Saxon and Trenton Oliver
Animated by Fabio Albertelli, Ivy Tello, Leigh Williamson, David Szakaly
Filmed by Petr Lebedev, Lui Kimishima and Derek Muller
Produced by Will Wood, Petr Lebedev, Han Evans and Derek Muller
Thumbnail by Ren Hurley
Additional video/photos supplied by Getty Images and NIED (E-defense)
Music from Epidemic Sound
The Mars Helicopter, Ingenuity aims to make the first powered flight on another planet when it takes off on Mars. It has now landed and safely checked in with the rover. It should detach and fly within the first 30-60 days of the mission. I learned a lot getting to visit the drone right before it was mounted on the rover at NASA Jet Propulsion Laboratory in Pasadena.
How do you fly in 1% of Earth's atmosphere:
Have large rotors (they are 1.2m in diameter) and spin them very fast, around 2500 RPM (5x the speed of a helicopter on Earth).
Plus the aircraft has to be light:
The Mars helicopter weighs in at 1.8kg or around the same as a laptop. Every piece had to be stripped down for weight. Instead of using aerogel for insulation, the craft makes use of CO2 gaps between components. Even aerogel was too heavy!
One of the major challenges is surviving the Martian night:
Temperatures plunge to -80C to -100C so two thirds of the craft's power is actually used to keep its electronics warm. Only one third is used for flying. The estimated flight time is 90 seconds.
The craft can't be driven remotely, it will have to fly autonomously, using its own sensor suite to determine how to fly. The round trip 20 minute delay with Earth means steering the craft from mission control would be impossible.
Huge Thanks to Patreon Supporters:
Philipp Volgger, Chris Vargas, Ron Neal, Alfred Wallace, Colin Bellmore, Michael Krugman, James Knight, Donal Botkin, Sam Lutfi, Mohammed Al Sahaf, Kevin Beavers, Chuck Lauer Vose, Bryan Baker, James Wong, kkm, Manuel Zürcher, Tige Thorman, Jasper Xin, Leah Howard, Daniel Milum, Mathias Göransson, Stan Presolski, Lyvann Ferrusca, Arjun Chakroborty, June Kang, Listen Money Matters, Pindex, Joar Wandborg, DALE HORNE, Parker Linn, Roberto Rezende
Jonny Hyman was a legend in editing, animation, filming, and sound design for this video.
I've created an educational product to help people learn chemistry!
You can buy it here: http://www.snatoms.com
How an SAT question became a mathematical paradox. Head to https://brilliant.org/veritasium to start your free 30-day trial, and the first 200 people get 20% off an annual premium subscription.
Special thanks to our Patreon supporters! Join this list to help us keep our videos free, forever:
https://ve42.co/PatreonDEB
I invented Snatoms, a molecule modeling kit where the atoms snap together magnetically. Try it at https://ve42.co/SnatomsV
Huge thanks to Dr. Doug Jungreis for taking the time to speak with us about this SAT question.
Thanks to Stellarium, a wonderful free astronomy simulator – https://ve42.co/Stellarium
Thanks to Newspapers.com, a database of historical newspapers – https://ve42.co/Newspapers
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References:
Summary of this problem by MindYourDecisions – https://www.youtube.com/watch?v=kN3AOMrnEUs
More cool math about this problem by Kyle Hill – https://www.youtube.com/watch?v=_zCDbB9wvrc
Discussion of a solar day by MinutePhysics – https://www.youtube.com/watch?v=nZMMuv0Ltyo
Murtagh, J. (2023). The SAT Problem That Everybody Got Wrong. Scientific American – https://ve42.co/SATSciAm
United Press International (1982). Error Found in S.A.T. Question. New York Times – https://ve42.co/SAT-NYT
Yang (2020). What's the hardest SAT math problem that you've seen? Quora – https://ve42.co/SATQuora
Coin rotation paradox via Wikipedia – https://ve42.co/CoinParadox
Simmons, B. (2015). Circle revolutions rolling around another circle. MathStackExchange. – https://ve42.co/CircleRoll
Sidereal time via Wikipedia – https://ve42.co/SiderealWiki
Solar Time vs. Sidereal Time via Las Cumbres Observatory – https://ve42.co/SiderealLCO
Images & Video:
Zotti, G., et al. (2021). The Simulated Sky: Stellarium for Cultural Astronomy Research - https://ve42.co/Stellarium
Newspapers from 1980s - 1990s via Newspapers.com – https://ve42.co/Newspapers
SAT Practice Test via the College Board – https://ve42.co/PracticeSAT
Revolution Definition via NASA – https://ve42.co/RevolutionNASA
Revolution Definition via Merriam-Webster – https://ve42.co/RevolutionWebster
Earth motion animation via NASA – https://ve42.co/OrbitNASA
Satellite animation via NASA – https://ve42.co/SatNASA
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Special thanks to our Patreon supporters:
Adam Foreman, Anton Ragin, Balkrishna Heroor, Bernard McGee, Bill Linder, Burt Humburg, Chris Harper, Dave Kircher, Diffbot, Evgeny Skvortsov, Gnare, John H. Austin, Jr., john kiehl, Josh Hibschman, Juan Benet, KeyWestr, Lee Redden, Marinus Kuivenhoven, Max Paladino, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Stephen Wilcox, Tj Steyn, TTST, Ubiquity Ventures
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Directed by Emily Zhang
Written by Emily Zhang and Gregor Čavlović
Edited by Peter Nelson
Animated by Ivy Tello and Fabio Albertelli
Filmed by Derek Muller
Produced by Emily Zhang, Han Evans, Gregor Čavlović, and Derek Muller
Thumbnail by Ren Hurley
Additional video/photos supplied by Getty Images and Pond5
Music from Epidemic Sound
What happens when you shrink robots down to the size of insects? Let’s explore the mind-bending physics behind their superpowers! Engineers get Onshape Professional free up to 6 months: go to https://www.onshape.pro/veritasium to create CAD models and bring your ideas to life.
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00:00 The Problem Of Surface Tension
3:16 How Does A Bee Fly?
7:08 What Powers Something So Small?
8:16 Tiny Muscles
10:36 Pogo Sticks On Mars
11:27 Mini Search Parties
13:29 Swarms Of Spybots
15:55 Penny Sized Combustion Engines
18:40 Science For Science’s Sake
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A massive thank you to Kevin Chen and the Soft and Micro Robotics Laboratory at MIT.
for hosting us and showcasing their incredible robots. Do check out their paper Acrobatics at Insect Scale: https://www.science.org/doi/10.....1126/scirobotics.ad
We’re incredibly grateful to Mechanical Engineering at Cornell and the Harvard Microrobotics Lab for their groundbreaking work that informed much of what we’ve shared here.
Special thanks to Pakpong Chirarattananon and Cameron Aubin for their expertise and insights into mini-robot science.
CORRECTION: The scale bar at 18:19 is wrong. It should be 2cm, not 2mm. Thanks @nicolaszaugg5825 for pointing it out.
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If you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically. https://snatoms.com/
Sign up to the Veritasium newsletter for weekly science updates - https://ve42.co/Newsletter
References: https://ve42.co/botsrefs
Video and Image Credits:
Giving bug-like, flying robots a boost by MIT via YouTube - https://ve42.co/FlyingRobots
Leading edge vortex stably attached near the base of a freely flying maple seed Acer pseudo-platanus by Francis Villatoro via YouTube - https://ve42.co/VortexStab
NASA Mars Helicopter Ingenuity Animations by JPLRaw via YouTube - https://ve42.co/IngenuityAnim
Rolls-Royce | SWARM Robots by Rolls Royce via YouTube - https://ve42.co/SWARMRobots
Robot Rescue: Behind The Technology Deployed For Disaster Relief | by NBC News via YouTube - https://ve42.co/RobotRescue
Call to Service: The Final Rescue of 9/11 by 5.11 Tactical via YouTube - https://ve42.co/CallToService
Colony Collapse: The Mystery of the Missing Bees | Retro Report | by NYT via YouTube - https://ve42.co/ColonyCollapse
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Adam Foreman, Albert Wenger, Alexander Tamas, Anton Ragin, Autodidactic Studios, Bertrand Serlet, Blake Byers, Bruce, Dave Kircher, David Johnston, Evgeny Skvortsov, Farbod Mansorian, Garrett Mueller, Gnare, Greg Scopel, I. H., Juan Benet, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Spilmann Reed, TTST, Tj Steyn, Ubiquity Ventures, gpoly, meg noah, wolfee
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Directed by Henry van Dyck
Written by Henry van Dyck
Edited by Nick Lear and Trenton Oliver
Animated by Fabio Albertelli, Jakub Misiek, Emma Wright and Ivy Tello
Filmed by Henry van Dyck, Petr Lebedev and Michael Cimpher
Additional Research by Geeta Thakur and Gabe Strong
Produced by Derek Muller, Henry van Dyck, Rob Beasley Spence, and Tori Brittain
Thumbnail contributions by Ben Powell, Peter Sheppard, Ren Hurley and Henry van Dyck
Additional video/photos supplied by Getty Images and Story blocks
Music from Epidemic Sound
*Watch with headphones on!
Is 45 minutes really the longest anyone can stay in a perfectly silent, pitch-black room?
Support Veritasium on Patreon http://bit.ly/VePatreon
Check out Audible: http://bit.ly/AudibleVe
Want to watch the whole hour of silence? http://youtu.be/jr1UMFC9DV0
Many stories have circulated claiming the longest anyone has stayed in an ultra-quiet anechoic chamber is 45 minutes, the reason being any longer would drive you insane. To me this sounded like unsubstantiated rubbish, like the claim the Great Wall is the only manmade structure visible from space. So I put my own psyche on the line, subjecting myself to over an hour of the most intense quiet on Earth. No, this was not THE quietest room on Earth (-9dB) but it is one of the quietest, and the truth is once you put a person inside, they are by far the loudest thing in there so the sound rating of the room is irrelevant.
I was not surprised to find that I could stay in there for as long as I liked and feel perfectly fine. What was surprising is that my heartbeat was audible. You can hear it on the sound recording. Now I wasn't consciously aware of the sound of my heart while in the room, but I was more aware of the feeling of it beating.
Huge thank you to everyone at BYU: Duane Merrell, Spencer Perry, Cameron Vongsawad, Jazz Myers, Ann Clawson, and Robert Willes.
Scientists like Prof Sinclair have evidence of speeding up, slowing, and even reversing aging.
Thanks to LastPass for sponsoring this video. Click here to start using LastPass: https://ve42.co/VeLP
What causes aging? According to Professor David Sinclair, it is a loss of information in our epigenome, the system of proteins like histones and chemical markers like methylation that turn on and off genes. Epigenetics allow different cell types to perform their specific functions - they are what differentiate a brain cell from a skin cell. Our DNA is constantly getting broken, by cosmic rays, UV radiation, free radicals, x-rays and regular cell division etc. When our cells repair that damage, the epigenome is not perfectly reset. And hence over time, noise accumulates in our epigenome. Our cells no longer perform their functions well.
To counter this decline, we can activate the body's own defenses against aging by stressing the body. Eat less, eat less protein, engage in intense exercise, experience uncomfortable cold. When the body senses existential threats it triggers longevity genes, which attempt to maintain the body to ensure its survival until good times return. This may be the evolutionary legacy of early bacteria, which established these two modes of living (repair and protect vs grow and reproduce). Scientists are uncovering ways to mimic stresses on the body without the discomfort of fasting. Molecules like NMN also trigger sirtuins to monitor and repair the epigenome. This may slow aging.
Reversing aging requires an epigenetic reset, which may be possible using Yamanaka factors. These four factors can revert an adult cell into a pluripotent stem cell. Prof. Sinclair used three of the four factors to reverse aging in the retinal cells of old mice. He found they could see again after the treatment.
Special thanks to:
Professor David Sinclair, check out his book "Lifespan: Why We Age & Why We Don't Have To"
Assistant Professor David Gold
Noemie Sierra (for polyp images)
Genepool Productions for telomere animations from Immortal: https://ve42.co/immortal
Epigenetics animations (DNA, histones, methylation etc) courtesy of: http://wehi.tv
Animation: Etsuko Uno
Art and Technical Direction: Drew Berry
Sound Design: Francois Tetaz & Emma Bortignon
Scientific Consultation: Marnie Blewitt
Courtesy of Walter and Eliza Hall Institute of Medical Research
Filming, editing and animation by Jonny Hyman and Derek Muller
Music from https://epidemicsound.com "Clearer Views" "Innovations" "A Sound Foundation" "Seaweed"
Additional music by Kevin MacLeod from https://incompetech.com "Marty Gots a Plan"
I got the chance to interview Bill Gates so I asked him: Will Covid-19 be the last pandemic? How does he deal with misinformation and conspiracy theories? And what is the next disaster? The Foundation Letter is here: https://ve42.co/BG21
Special thanks to Patreon supporters:
Ludovic Robillard, jim buckmaster, Robert, fanime96, Marc Forand, Juan Benet, Robert Blum, Grace O'Maille KRON x Arc iOS, Richard Sundvall, Lee Redden, Vincent, Lyvann Ferrusca, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex , Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal
Thanks to Petr Lebedev for the thumbnail, early edits and Jonny Hyman for feedback
In a zero-g plane I experimented with flames and slinkies with surprising results.
Check out e-penser's video: http://ve42.co/EPzeroG
Check out Physicsgirl's video: http://ve42.co/PGzeroG
Thanks to Novespace: http://ve42.co/novespace
Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Nick Luchsinger, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen
The zero-g plane allows for a lot of experiments to be conducted without the expense of getting equipment into orbit. Apparently 80% of microgravity research can be performed in a zero-gravity plane, which is much cheaper than going to space. The flame from the lighter seemed much lazier in zero-g because without weight there is no buoyant force and therefore no convection. This makes the process of combustion more challenging because it's difficult for oxygen to reach the fuel.
Music from the Epidemic Sound: http://ve42.co/epidemic
"Serene Story 2" "In Orbit 2"
Thank you to Rodney Fox for sharing his story. He was attacked by a shark 50 years ago - Dec. 8 1963. If you're interested in his book or in going shark cage diving in South Australia, check out: http://bit.ly/rodneyfox
Imagine solving a rabies outbreak with chicken heads.
#kurzgesagt
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We got a bird flu simulator before GTA 6... 🐔
But seriously – why does bird flu spread so quickly and why is it so difficult to contain its spread? Let's look at it together.
#kurzgesagt
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Did you know whales evolved from dog-sized land animals? Meet Pakicetus, the ancestor that started it all.
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A nuclear war doesn’t take weeks or days, it unfolds in minutes. In this scenario, 86 missiles are on the way and only you, the president, can authorize a counterattack. What would you do?
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Size is the most under appreciated regulators of living things. Let us demonstrate that by throwing animals from buildings.
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What Happens If We Throw an Elephant From a Skyscraper? Life & Size 1
