Discover the life and work of the great Greek philosopher.
A weird circular shape on Google Earth has ocean-floor UFO hunters crying "alien."
Researchers using a giant electromagnet suspended from a helicopter have created a detailed map of the hydrothermal system underneath Yellowstone National Park for the first time.
Air crash investigators are trying to figure out why a passenger jet in China nosedived so steeply into the ground, killing all 132 people on board.