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
What’s wrong with that map? Spherical Geometry | Science4All 9
What’s a straight line? Curved-space geometry | Science4All 10
What’s Einstein’s gravity? General relativity explained! Science4All 15
What’s the destiny of the universe? Einstein’s biggest blunder | Science4All 18
