Volcanoes, not pollutants, damp down global warming

Global warming over the last ten years or so would have been more extreme if it weren't for volcanoes, says a team from the University of Colorado, Boulder.

Human ancestor ate bark like a chimp

Bits of food stuck between the teeth of a two-million-year-old South African hominid show that, unlike almost all other known human ancestors, it ate tree bark and other hard foods.

UAV could be most efficient yet

University of Colorado Boulder researchers say they've developed a UAV that flies farther and faster, and uses less fuel, than any other of its size.