Other Topics of Interest
U.S.A. Mathematical Olympiad
International Mathematics Olympiad (IMO)
Bertrand's Paradox
(a discovery that made mathematicians wary of the whole notion of probability)
Mathematical Games and Recreations
(History of Mathematics archive-U St Andrews)
Recreational Mathematics
(David Eppstein-UC Irvine)
Eisenhower National Clearinghouse (ENC) Online (K-12 Math Resources)