*Watch with headphones on!
Is 45 minutes really the longest anyone can stay in a perfectly silent, pitch-black room?
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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.
A trip to #Mars involves radiation, muscle and bone loss, intermediate axis theorem and liquids. Check out Mars on National Geographic, Monday Nov 12 at 9/8c #sponsored When I got offered the chance to fly in another #zeroG plane, I jumped at the chance. Do you know how hard it is when you are thrust into low-gravity, like the 37% of Earth's gravity of Mars, and you have to remember what you were going to say in a 30 second window as blood floods your head? It's pretty hard. It would be even harder to actually travel to Mars. It would take about 8 months in microgravity during which time your muscles and bones would weaken substantially, even if you exercise for hours a day like the astronauts on the space station. And your heart is a muscle too so it weakens as well. Before I contemplated these rates of muscle and bone loss, I thought the major challenge with a round trip journey to Mars would be the logistics of spacecraft and having enough fuel to get back. But with the weakening of the human body, it's an open question whether anyone would really want to come back. Filmed by Steve Boxall Music from Epidemic Sound: http://epidemicsound.com
Brilliant: https://brilliant.org/vsauce2 Thanks to Brilliant for sponsoring this episode. *** SOURCES LINKS AND MORE *** “The Ways of Paradox and Other Essays” by Willard Van Orman Quine: https://www.amazon.com/Ways-Paradox-Other-Essays-Revised/dp/0674948378/ Zeno of Elea, Stanford Encyclopedia of Philosophy: https://plato.stanford.edu/entries/zeno-elea/ Zeno’s Paradoxes, Stanford Encyclopedia of Philosophy: https://plato.stanford.edu/entries/paradox-zeno/ Convergent Series, Khan Academy: https://www.khanacademy.org/math/calculus-home/series-calc/seq-conv-diverg-calc/v/convergent-and-divergent-sequences “Game Show Problem” by Marilyn vos Savant, Parade Magazine, 1990: http://marilynvossavant.com/game-show-problem/ “Solution to the Grandfather Paradox” by minutephysics: https://youtu.be/XayNKY944lY “The Faint Young Sun Paradox!” by MinuteEarth: https://youtu.be/qbnaes8X4iQ *********************************** Vsauce Links Website: http://www.Vsauce.com Twitter: https://twitter.com/VsauceTwo Facebook: https://www.facebook.com/VsauceTwo Hosted, Produced, Writing Contributions And Edited by Kevin Lieber Instagram: http://instagram.com/kevlieber Twitter: https://twitter.com/kevleeb Website: http://kevinlieber.com Research And Writing Contributions by Matthew Tabor https://twitter.com/matthewktabor Writing Contributions by Michael Stevens https://youtube.com/Vsauce VFX By Eric Langlay https://www.youtube.com/c/ericlanglay Special Thanks Paula Lieber https://www.etsy.com/shop/Craftality Select Music By Jake Chudnow: http://www.youtube.com/user/JakeChudnow
The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram. Support Veritasium on Patreon: http://bit.ly/VePatreon A kilogram isn't what it used to be. Literally. The original name for it was the 'grave', proposed in 1793 but it fell victim to the French Revolution like its creator, Lavoisier. So begins the tale of the most unusual SI unit. The kilogram is the only base unit with a prefix in its name, and the only one still defined by a physical artifact, the international prototype kilogram or IPK. But the problem with this definition has long been apparent. The IPK doesn't seem to maintain its mass compared to 40 similar cylinders minted at the same time. The goal is therefore to eliminate the kilogram's dependence on a physical object. Two main approaches are being considered to achieve this end: the Avogadro Project and the Watt Balance. The Avogadro project aims to redefine Avogadro's constant (currently defined by the kilogram -- the number of atoms in 12 g of carbon-12) and reverse the relationship so that the kilogram is precisely specified by Avogadro's constant. This method required creating the most perfect sphere on Earth. It is made out of a single crystal of silicon 28 atoms. By carefully measuring the diameter, the volume can be precisely specified. Since the atom spacing of silicon is well known, the number of atoms in a sphere can be accurately calculated. This allows for a very precise determination of Avogadro's constant. Special thanks to Katie Green, Dr. David Farrant, the CSIRO, and the National Measurment Institute for their help. Thanks also to Nessy Hill for filming and reviewing earlier drafts of this video. There is debate as to whether this is truly the roundest object ever created. The Gravity Probe-B rotors are also spherical with very low tolerances such that they may in fact be rounder. Music by Kevin McLeod (incompetech.com) Decision, Danse Macabre, Scissors
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Never miss a talk! SUBSCRIBE to the TEDx channel: http://bit.ly/1FAg8hB Jay Gilligan is a professional juggler and performer from Arcadia, Ohio currently performing and living in Europe. Jay is the main teacher of juggling and creator of the juggling program at the University of Dance and Circus in Stockholm, Sweden. In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events are branded TEDx, where x = independently organized TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organized.* (*Subject to certain rules and regulations) In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events are branded TEDx, where x = independently organized TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organized.* (*Subject to certain rules and regulations)
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