The source for this claim is called history
315 karma · joined May 4, 2016
Use google translate if you don't speak spanish
US Air Force connects 1,760 PlayStation 3's to build supercomputer https://phys.org/news/2010-12-air-playstation-3s-supercomput...
21 Million btc? Bitcoins are divisible so if the unit is considered the smallest division, there are 2.100.000.000.000.000 units.
What happens when the last btc is mined? Well, storing and shipping gold bars is also expensive and that doesn't make gold worthless
(jk)
Store your files in the dropbox folder and they will be safe (plus sync across devices and file history).