Episode Clips

How Did the Moon Come to Be?

Scientists have several theories for how Earth's Moon formed.

Scientists Launch Rocket into the Moon to Find Water

Researchers hope to observe lunar material ejected from an impact.

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Lost Viking Army

Bioarchaeologists investigate a 9th-century mass grave thought to hold a lost Viking army.

First Horse Warriors

The advent of horse riding changed the course of human history and our genetic makeup.

Inside the Megafire

Scientists investigate the deadly megafires that swept through California in 2018.

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