nostr:npub176rch4xvrlu8d7pfpyswwqsg3g0ygc809gjxhjuw8jpy6cv9uv5sgpua66 nostr:npub1xewavcy9m079c9hnvvjxqceljtau6c6d9rgn272cw5kdvejp8mysdjzmfc - very little is known for sure about what Pythagoras did.   I read a book-long biography of him which starts by listing everything known about him in the first paragraph: he was the son of Mnesarchus, a gem-engraver, and around 530 BC he travelled to Croton in southern Italy.  The rest is echoes of echoes of echoes.