Neanderthal - Them, and other hominids that came before us or coexisted with us. Nowadays it's another part of the strange story of our collective being.
Big Bang Theory - Who doesn't want to know where we came from?
[anything here] Period/Era/Epoch - Even though Dinosaurs tend to get front billing, most anything from prehistory interests me. Maybe it's because we know so little about it.
Swear filter - I don't know how this feature could exist in so many games and online services and not have a page dedicated to it. I once got bored and made a reverse swear filter for a message board I created in PHP. It turns minced oaths like "heck" and "darn" into their more fun forms. :)