How did military conflict fit into the end of a mighty civilization? AP Photo/Moises CastilloTwo trophy skulls, discovered by archaeologists in the jungles of Belize, may help shed light on the little-understood collapse of the once powerful Classic Maya civilization. The defleshed and painted human skulls, meant to be worn around the neck as pendants, were buried with a warrior over a thousand years ago at Pacbitun, a Maya city. They likely represent gruesome symbols of military might: war trop