Peter Norvig is a polymath who’s also the director of search quality at Google. His site is an eclectic treasure trove. For Python programmers, there’s the Python IAQ (Infrequently Answered Questions), for Java programmers, there’s the Java IAQ. For word geeks, there’s the 15,139-word palindrome, for math geeks, there’s Search for counterexamples to Beal’s Conjecture. And so on and so on. Go take a look.