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Before it was a dry planet, Mars was a wet world that may have hosted life.

The life of our solar system told in five dramatic stories spanning billions of years.

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

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

In the shadow of Vesuvius and Pompeii, a lesser-known volcano puts Naples at risk.

New archeological evidence shows the stunning engineering of the Great Pyramid of Giza.

Peer into the universe’s deep unknowns to explore the mysteries of dark matter and energy.

How does today’s artificial intelligence actually work—and is it truly intelligent?

Can we crack the code of animal communication?

Follow engineers and woodworkers as they rebuild and transport an iconic American bridge.

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