A moderately strong, 5.5-magnitude earthquake struck in Ethiopia on Sunday, according to the United States Geological Survey.

Here's how early humans spread from East Africa all around the world. Produced by Alex Kuzoian Follow BI Video: On Facebook More from Science It's tough to know what happened on Earth thousands of ...

To the Ends of the Earth: East Africa is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet ...