Einfach folgen, man wird es nicht bereuen

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Can you glue opposite edges of a square? This is a conundrum that many of the greatest mathematicians couldn't figure out. While John Nash did answer yes, he couldn't say how. After 160 years of research, the Hévéa project finally did it! And it is spectacularly beautiful!

YouTube: Can you glue opposite edges of a square? Science4All #7 (Science4All)