# Vsauce

A handful of numbers have a very special property: you can add their digits together and divide the original number by their total without a remainder. And why does it matter? Well, in terms of mathematics, it’s mostly a curiosity. Dattatreya Ramchandra (D. R.) Kaprekar saw these numbers as sparking joy in the mind, so
Bitdefender Total Security (Extended Free Trial) – https://www.bitdefender.com/media/html/consumer/new/WI-S-Bitdefender/?cid=inf&7Cc%7Cig¾7CVS2Q4 Thanks to Bitdefender for supporting Vsauce2. We know what infinity is… it’s something that never ends. It’s right in the name: ‘doesn’t finish.’ But is it possible to have more than one infinity? Can one infinity be larger than another? And if we say yes or no,
Bitdefender Total Security (Extended Free Trial) – https://www.bitdefender.com/media/html/consumer/new/WI-S-Bitdefender/?cid=inf%7Cc%7Cyt%7CVS204 Thanks to Bitdefender for supporting Vsauce2. As math and our minds both become more sophisticated, we can use strategies like probability to fill gaps in the unknown. That’s particularly useful in a court of law, where we almost never have all the facts we need. But what
Just because you see a number like 100,000 doesn’t mean it’s actually 100,000. We operate in a base-10 numeral system, and it’s got the familiar 10-based decimal root — and “decimal” even comes from the Greek “deca” prefix meaning 10. But… not everyone thinks of the world in tens. Mainland Europeans used dozens, the Chinese
Where would we be with this dot?! It doesn’t seem like much, but it’s a critical element to our quick understanding of numbers. Without a decimal point or radix point, we have to mentally solve a little puzzle to figure out what the numbers we see actually mean. But with it, we know exactly what
What do you do when you’ve got a mathematical expression that’s unsolvable because the numbers you need don’t exist? You do what Hero of Alexandria did: you just invent one. That’s how we got the concept of imaginary numbers, which Rene Descartes derided as being totally useless. Turns out he was wrong. #shorts
Go to https://keeps.com/Vsauce2 to get 50% off your first order of Keeps hair loss treatment. Thanks to Keeps for sponsoring this video. When Joyce Ann Brown saw her name in the newspaper in connection with a gruesome murder, she went straight to the police to clear up the obvious error. She was at work when
Find out which companies have your data and reclaim it by visiting: https://bit.ly/saymine-vsauce2 Thanks to Mine for supporting Vsauce2. When tragedy struck Madrid on March 11, 2004, the international community including the FBI rushed to help Spanish police identify the perpetrators. Some of them were too eager. A partial fingerprint match to Oregon lawyer Brandon
What IS 1? It seems like a really stupid, obvious question, but the truth is that 1 is seriously complex. Is it even a number? Number theory pushes and pulls on 1, showing that it’s everything all at once — yet sometimes it’s powerless. Cube it, multiply, divide it… whatever you do, it’s the unity.
Just think of all the questions that arise when a seemingly-healthy baby dies. Was there an illness that went undetected? Was there a rare genetic defect that couldn’t possibly have been known? Are any signs of physical trauma related to the resuscitation efforts of a fragile infant, or something more sinister? Every time a baby
Subscribe to our Curiosity Box! http://www.curiositybox.com/bogo Add the Summer Box to your cart, use code BOGO, and get the summer box FREE! FOLLOW ME: Tweets by tweetsauce https://www.instagram.com/electricpants/ LINKS TO LEARN MORE: BOOKS: Metametaphysics (Eds. Chalmers, Wasserman) An Introduction to Metametaphysics (Tahko) Material Beings (Peter Van Inwagen) Objects and Persons (Trenton Merricks) Ordinary Objects (Amie