What was the "Riddle of the Sphyinx"?

Answer 1

the one where the thing has 4 legs then 2 legs then 3?

a human.

you crawl as a baby, stand when you get older, and should use a can when youre really old.

Answer 2

What walks on 4 legs in the morning,2 legs in the afternoon and 3 legs at night. Answer: man.

Answer 3

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Answer 4

http://www.users.globalnet.co.uk/~loxias/sphinx.htm