Science and Technology

Human ancestors were exposed to lead millions of years ago, and it shaped our evolution

A 2 million-year-old tooth of an early human ancestor. Fiorenza and Joannes-Boyau

When we think of lead poisoning, most of us imagine modern human-made pollution, paint, old pipes, or exhaust fumes. But our new study, published today in Science Advances, reveals something far more surprising: our ancestors were exposed to lead for millions of years, and it may have helped shape the evolution of the human brain.