SciShow
How Ancient Human Clues Ended Up in Rock
A lot of what we know about ancient human civilizations comes from the things they leave behind. But sometimes, humans don’t live in places long enough to leave these clues. So, some researchers have turned to techniques outside...
SciShow
5 Clues to Earth's Climate History
As Earth’s climate changes, one of the hardest things to figure out is exactly how the planet will change in response. And while we can’t know the future for sure, we can get a lot of good clues from the past.
PBS
Pbs Teachers:caves
Explore the California Cavern. Watch two kids use the scientific method to determine how formations change as they travel into deeper parts of a cave.