The world depends on one chunk of metal for measuring the mass of everything on earth. We check out a copy of that official kilogram in Gaithersburg, and explore why the cylinder's mass is mysteriously changing.
Centuries of silver mining have left Cerro Rico mountain in the southern highlands of Bolivia on the verge of collapse. The Spanish forced Quechua Indian slaves into the mines to bankroll their empire. Today, the Quechua own the mines, but conditions here are still brutal.
First came the news that Arctic sea ice is in sharp decline this year. Now, research indicates that springtime snow is melting away even faster than the ice. And that has profound implications for the Earth's climate.
Muscular fish like salmon, tuna and eel can benefit from more exercise in a farmed fish environment. New research and a new book are aiming to convince fish farmers that getting fish to swim faster will mean healthier products, less waste, and more profit.
Sheep and goats grazing on a hillside in Vermont: It's a pastoral image. Now, it's how one New England town is keeping the grass trimmed in its centuries-old cemeteries. And the greener lawn maintenance method is paying off.
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