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Elephant Teeth

Elephants don't diet, as far as we know. But their weight does fluctuate, at least for the ones who live in a zoo. Now, researchers have found that this gain and loss in an elephant's mass appears to hinge on their jaws - more specifically, the unusual way these animals replace their teeth. The results appear in the journal Mammalian Biology.

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Sleep Rocking

Every new parent knows, or learns pretty quickly, that rocking can calm that fussy baby when it's time to take a nap. But the benefits of gentle motion may extend past the swaddling stage. Because two new studies show that rocking also helps grown-ups, both human and mouse, get a good night's sleep. The two research efforts are in the journal Current Biology.

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