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How do viruses work? Sort of like an alien invasion that replaces our cell’s genetic code.

Timeline clip - TR’s political career starts

It’s time to answer the age old question – Is Pluto actually a planet or not?

Step behind the scenes of Ken Burns’s new film to see how The American Revolution came to life.

Explore the story of the U.S. Senator for Hawai’i who championed the cause of justice and equality.

In Brazil’s Atlantic Forest, Mauricio Ruiz has turned his love for nature into action.

Market Mohawk was demolished in the 1960s, displacing families and erasing historic landmarks.

Boeing's CEO appears at the company's annual meeting Monday morning in Chicago. It's the first time he'll face shareholders since two fatal crashes involving the now-grounded 737 Max 8 passenger jet.

It's often compared to Spain's running of the bulls, except there are no red-eyed, snorting bulls, just brides-to-be. And they're running toward racks of…

President Trump downplays disagreements over intelligence.