*Watch with headphones on! Is 45 minutes really the longest anyone can stay in a perfectly silent, pitch-black room? Support Veritasium on Patreon Check out Audible: Want to watch the whole hour of silence? 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.
Stained glass is thicker at the bottom - so is it a liquid? Earth's mantle enables plate tectonics, so is it a liquid? Check out Audible: Sign up for the mailing list: Pitch drop experiment: Thanks to Meg Rosenburg for scripting and animation, Raquel Nuno for filming and Aaron White for script consultation. What is 6÷2(1+2) =? This problem went viral and generated millions of comments on Facebook, Twitter, YouTube and social media sites. I explain how to get the correct answer by using the modern interpretation of the order of operations. I also explain how you would get a different answer under historical usage of the division symbol. *I get many, many emails about this problem. Before you send an email, check out my blog post or in the links provided below which address every concern I have received so far. If you write to me about this be advised I probably will not respond. Blog (text explanation): Slate explains the history of the division symbol Here is a 1917 article from "The American Mathematical Monthly" that explains the usage of the division symbol as an exception to the order of operations Google evaluation WolframAlpha evaluation If you like my videos, you can support me at Patreon: Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method is most convenient for you. My Blog: Twitter: Facebook: Google+: Pinterest: Tumblr: Instagram: Patreon: Newsletter (sent about 2 times a year): If you buy from the links below I may receive a commission for sales. This has no effect on the price for you. My Books "The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3. 8 5 stars on 31 reviews) "The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5 5 stars on 2 reviews) "Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4. 4 5 stars on 13 reviews. "Math Puzzles Volume 2" is a sequel book with more great problems. (rated 5 5 stars on 3 reviews) "Math Puzzles Volume 3" is the third in the series. (rated 3. 8 5 stars on 4 reviews) "40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4. 3 5 stars on 12 reviews) "The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4. 7 5 stars on 4 reviews) "Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5 5 stars on 3 reviews).
420 million years ago, a giant feasted on the dead, growing slowly into the largest living thing on land. It belonged to an unlikely group of pioneers that ultimately made life on land possible - the fungi. Produced in collaboration with PBS Digital Studios: Thanks to Franz Anthony of 252mya and Jon Hughes of jfhdigital for their tremendous reconstructions of Prototaxites. Want to follow Eons elsewhere on the internet? Facebook - Twitter - Instagram - References: ~419mya. Does quantum entanglement make faster-than-light communication possible? What is NOT random? First, I know this video is not easy to understand. Thank you for taking the time to attempt to understand it. I've been working on this for over six months over which time my understanding has improved. Quantum entanglement and spooky action at a distance are still debated by professors of quantum physics (I know because I discussed this topic with two of them). Does hidden information (called hidden variables by physicists) exist? If it does, the experiment violating Bell inequalities indicates that hidden variables must update faster than light - they would be considered 'non-local'. On the other hand if you don't consider the spins before you make the measurement then you could simply say hidden variables don't exist and whenever you measure spins in the same direction you always get opposite results, which makes sense since angular momentum must be conserved in the universe. Everyone agrees that quantum entanglement does not allow information to be transmitted faster that light. There is no action either detector operator could take to signal the other one - regardless of the choice of measurement direction, the measured spins are random with 50 50 probability of up down. Special thanks to: Prof. Stephen Bartlett, University of Sydney: Prof. John Preskill, Caltech: Looking Glass Universe: Physics Girl: MinutePhysics: Community Channel: Nigel, Helen, Luke, and Simon for comments on earlier drafts of this video. Filmed in part by Scott Lewis: Music by Amarante "One Last Time".