Pattern formation is the developmental process by which cells acquire different identities, depending on their relative spatial positions within the embryo. Pattern formation ensures that tissues and ...

They were not, so the polemic went, the work of 'puny' man, but instead those 'giants of Mars'. Yes, the Pyramids of Giza - those monuments to god-like splendour that have stood for more than 4,000 ...

The amphitheater served as the ceremonial heart of a thriving city 4,600 years ago. George Steinmetz Why Did They Leave the Coast? Fishermen today ply Peru's coast in bull-rush boats as they have for ...

The peak of La Danta—one of the world's largest pyramids—pokes through the forest canopy. "All this was abandoned nearly 2,000 years ago," says archaeologist Richard Hansen. "It's like finding Pompeii ...