Post #4299856

@gregeganSF@mathstodon.xyz Note for anyone who may not know: > Joan Birman went back to grad school in math in her forties, and is now one of the top researchers in knot theory. — the top answer at https://mathoverflow.net/questions/3591/mathematicians-who-were-late-learners-list (According to Wikipedia she got her PhD in 1968 at age 41.)