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What would happen to Earth if humans went extinct?

This city is going green. Deep within Guatemala’s rainforest sits one of the most famous remnants of the Maya civilization: a roughly 2,000-year-old citadel turned to ruins called Tikal. When Alan Weisman hiked through the surrounding region, he discovered something…

Why doesn’t the US use the metric system?

Would you rather use inches or centimeters? How people measure stuff might seem pretty bland as topics go, but behind America’s insistence to keep drinking coffee in ounces and pumping gas in gallons lies a story with a weighty dose…