Learn how oxygen’s early rise could have given complex life the energy boost it needed to evolve.

The most widely accepted scientific explanation for the arrival of all complex life on Earth has had an unsolved mystery at its heart. According to the theory, all plants, animals and fungi, known ...

A new study explains how climbing down trees helped shape upright posture in early primates and changed the course of evolution.

Life on Earth may have learned to breathe oxygen long before oxygen filled the skies. MIT researchers traced a key oxygen-processing enzyme back hundreds of millions of years before the Great ...