Human History Recorded In Mud

When you step into mud, it kind of slurps up between your toes. What if someone found your mud-slurping footprint 15,000 years from now?

Scientists have uncovered 15,000 year old fossil human footprints, with incredible, mud-slurping detail. What do they tell us about the people that lived there? 

Make Lava, Not War

A sculptor and a geologist are melting hundreds of pounds of rock in a giant cauldron to create realistic lava flows. Cool! NPR reporter Adam Cole pays a visit to learn more about lava's allure.