The footprints offer a rare look at ancient human relatives crossing paths
Two ancient hominid species with slightly different gaits interbred in East Africa. Traces preserved on what was once a muddy […]
What would it take to protect the world from an asteroid?
How to kill an asteroidRobin George AndrewsWW Norton & Co., $29.99 The dinosaurs met a gruesome death at the hands
Einstein’s gravity persists despite a dark energy puzzle
Scientists may be wrong about dark energy. But they’re right about gravity, a new study suggests. Dark energy, the mysterious