A contagious tumor threatens to wipe out the famous Tasmanian devil. Could similarly "catching" cancers arise in humans, too?
How will we know when we've built a sentient computer? By making it solve a simple puzzle
One species of soil microbe makes unusually wise communal decisions
The surprising accident at Fukushima puts the spotlight on a new generation of U.S. nuclear reactors. Are they safe enough?
In the race to the South Pole, explorer Robert F. Scott refused to sacrifice his ambitious science agenda
Why Richard A. Muller wouldn't tell House climate skeptics what they wanted to hear
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