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 ...

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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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Europe’s wilderness hides some surprisingly large and powerful birds. This countdown explores seven species that stand out for their wingspan, weight, and presence, celebrating the evolution and ...