Learn about the comet impact hypothesis that may explain why North America lost most of its megafauna along with the Clovis culture around 13,000 years ago.

Learn how the brain handles certain optical illusions, causing us to perceive shapes that don't actually exist. 

Learn about the discovery of potential biosignatures within sedimentary rocks on Mars, which may represent signs of ancient microbial life. 

Learn how fragments from asteroid Ryugu provide evidence of water flowing within asteroids formed in the early Solar System. 

Learn why rivers in northern Alaska are turning orange, causing aquatic ecosystems to become increasingly toxic.