The first unmistakable signal from another intelligence may not be a cheerful greeting. A growing group of researchers is ...

Could the first confirmed signal from an extraterrestrial source be less a hello than a goodbye? Astrophysicist David Kipping argues as much, and his “Eschatian Hypothesis” reimagines the way ...

Anthropologist Margaret Mead said the first sign of civilization in an ancient culture is a femur that had been broken and then healed. She theorized that in the animal kingdom, if you break your leg, ...

With the thick vegetation of the northern Guatemala rainforests hiding its 2,000-year-old remnants, the full extent of the early Mayan way of life was once impossible to see. But laser technology has ...