chew on this

Look: 4.5 million-year-old teeth reveal a vital aspect of human evolution

Dec. 1, 2021

Deniz Celiker/Moment/Getty Images

When it comes to mammals, males tend to be more aggressive than females.

Shutterstock

Manoj Shah/Photodisc/Getty Images

Our primate cousins are especially known for their brutal fights over territory or mates.

Tap

Space, Time, Dinosaurs, and Other Essential Topics

Get the best of science—space missions, black holes, futuristic biology—delivered daily, minus the jargon.