Hibernating insects regrow muscles on demand

Even as gas prices soar, most people don't destroy their car's engine just to save energy—and that's one luxury certain insects have that those humans don't.

Is there a limit to human endurance? Science says yes

From the Ironman triathlon to the Tour de France, some competitions test the limits of even the toughest endurance athletes. Now, a new study of energy expenditure during some of the world's longest, most grueling sporting ...

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