Across seven continents, evolution built giants that traded wings for muscle. From South America’s rheas to Australia’s cassowaries, this ranking uses biological data to determine which flightless ...

Two-time Olympic marathon champion Eliud Kipchoge says he'll run seven marathons on seven continents over the next two years to raise funds for causes he believes in – even as he continues to race at ...

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Thanks to Verizon for support of this Our Shared Future: Reckoning with our Racial Past project. These files consist of 3D scans of historical objects in the collections of the Smithsonian and may be ...

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