A reader passes along an unsettling segment on insects:
Another reader writes:
Dan Dennett gave a talk at TED a few years ago wherein he discussed a brain parasite that causes ants to commit suicide. The parasite can only reproduce in the belly of a cow, so it causes ants to climb to the top of grass stalks in a deliberate attempt to be eaten by a cow. It takes over the ant's mind. Can you image something like that in humans? Scary.