Greg Yaghmai is about to embark on an unprecedented challenge: running seven marathons on seven continents in just seven days.

A British submarine drove a Russian 'spy ship' out of UK waters in a dramatic confrontation over critical undersea cables.

The benefits of investing in African food systems extend far beyond the continent. Africa’s natural carbon sinks will ...

Here’s what to know about Trump’s proposal to add new restrictions in the U.S.—and how that compares to other countries.