Science4All (english)'s video: Hyperbolic Geometry Relativity 11

Believe it or not, my underpants contradict 2000 years of mathematical certainty! It's only in the 19th Century that Gauss, Lobachevsky and, Bolyai would get a grasp on the hidden geometry underlying my underpants --- the so-called hyperbolic geometry... which would lead to new fundamental insights into the nature of geometry itself! Can you glue opposite edges of a square? Nash's embedding | Science4All 7 https://www.youtube.com/watch?v=Bx0MOMvUxS8 What's wrong with that map? Spherical Geometry | Science4All 9 https://www.youtube.com/watch?v=SZsz3EchTA0 What's a straight line? Curved-space geometry | Science4All 10 https://www.youtube.com/watch?v=n8DB3mGXEUg What's Einstein's gravity? General relativity explained! Science4All 15 https://www.youtube.com/watch?v=zZDoSpiIxs0 What's the destiny of the universe? Einstein's biggest blunder | Science4All 18 https://www.youtube.com/watch?v=ZAiVf4zA6KI The Massive Puzzles of Gravity | Science4All Article http://www.science4all.org/le-nguyen-hoang/gravity/ Playing Sports in Hyperbolic Space | Numberphile https://www.youtube.com/watch?v=u6Got0X41pY Margaret Wertheim: The beautiful math of coral (and crochet) https://www.youtube.com/watch?v=zGEDHMF4rLI