A new study of chimpanzee and bonobo groups at zoos reveals similar levels of aggression. However, scientists found stark sex-based differences between the species.

The nearly complete 90-million-year-old fossil sheds light on its strange anatomy, like stubby arms and large thumb claws.

And why brain transplants aren’t an option.

For 45 years, astronomers believed that stars like our Sun would eventually flip their rotation pattern as they aged with the poles speeding up and the equator slowing down. It was one of those theoretical predictions that seemed rock solid, written into textbooks and built into stellar models. Now, researchers at Nagoya University in Japan have run the most powerful simulations of stellar interiors ever attempted, and the theory has collapsed. Stars like the Sun, it turns out, seem to keep the same rotation pattern for their entire lives.

Three years ago, a detector sitting on the floor of the Mediterranean Sea recorded a single subatomic particle carrying more energy than anything of its kind ever seen before. Where it came from has been a mystery ever since. Now, scientists working with the KM3NeT detector off the coast of Sicily think they may have found the culprit, a population of blazars, some of the most violent objects in the universe, each one powered by a supermassive black hole firing a jet of plasma directly toward Earth.