Simone Biles dazzles in her return following a two-year layoff to easily claim the U.S. Classic.

The Evolution of a Head Has Been Traced Back Surprisingly Far Up Our Ancestral Line

Florida Panthers Are Stumbling Like They're Poisoned, And Scientists Don't Know WhyThis Tiny 20-Million-Year-Old Skull Could Improve Our Understanding of Brain Evolution

A Huge, Mysterious Reservoir of Methane Has Been Identified Deep Under The OceanEarth's Mysterious Inner Core Could Finally Be Explained by New ScienceEarth May Have Supported Life Much Earlier Than We Thought, Study Suggests

'Super-Deep' Diamonds Reveal Vast Reservoir of Primordial Magma as Old as The MoonA Human-Sized Penguin Fossil Has Turned Up in New Zealand, Again

Incredible Fossil Fly Eyes Are Changing What We Know About Insect Eye Pigment

Scientists Grew a Mysterious Life Form That Could Reveal The Origins of Complex LifeThe Science of Affection That Makes Cats Knead You

Scientists Discovered Something Morbidly Mysterious at The Bottom of The Indian OceanYour Face Is Covered in Thousands of These, And They're Not Always Nice

Scientists Reconstructed a 2 Million-Year-Old Ecosystem From Ancient DNACrabs Aren't The Only Things Evolution Keeps Making. An Expert Explains.