The United States is the only country to pull out of the global agreement among nations to fight climate change. European diplomats say the U.S. reputation is suffering.
A newly discovered raptor had a knobby bump on its head, suggesting that, like some larger dinosaurs, it engaged in competitive head bashing.
Drawing on his love of fly-fishing, he developed a balloon catheter that removes blood clots from patients’ limbs in a minimally invasive way. It has saved millions of lives.
The finding, along with the discovery of a 500,000-year-old hammer made of bone, indicates that our human ancestors were making tools even earlier than archaeologists thought.
Cuttlefish attract prospective sexual partners by creating a pattern on their skin, based on the orientation of light waves.