BODY & BRAIN
Infants may learn speech sounds as they snooze. Read “Sleeping babies learn in an eyeblink.”
Researchers find a natural screwlike joint — in a beetle’s hip. See “Weevils evolved nut-and-screw joint.”
MATTER & ENERGY
An acoustic cloak made of metamaterials reflects sound off a bump as though it were a flat wall. Read “You haven’t heard it all.”
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