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The annual butterfly migration is underway. For decades scientists have relied on volunteers to tag butterflies to provide details about their journey.

Fossil fuel emissions have increased steadily for almost two centuries. Now, the world may soon reach an important turning point for climate change.

A T-rex fossil billed as one of the world's largest specimens was sold for a record $50.1 million Tuesday to a mystery bidder. But many aren't happy about it.

With his attack on Venezuela, President Trump says the Monroe Doctrine is back, reviving a more than 200-year-old foreign policy idea. In Cuba, residents brace for what that could mean for them.

The United States and Iran exchanged strikes aimed at infrastructure and military targets on Saturday as their battle over the Strait of Hormuz intensified.