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ANTIBACTERIAL BACKFIRE  Soaps that contain triclosan, a commonly used antimicrobial compound, could actually help disease-causing bacteria colonize the human nose. 

SMELL NO EVIL  Young damselfishes (shown) living in carbon dioxide-rich waters have trouble detecting predator odors, compared to fish in areas with less CO2 dissolved in the water.  

WALK IT BACK  A new analysis of 3.6-million-year-old footprints excavated in 1978 at Laetoli, Tanzania, challenges the argument that early hominids strode in much the same manner as people today do. Shown is a cast of two of the 70 footprints.

GREEN POWER  Rapid adoption of alternative power production, including wind, solar and nuclear power, will be necessary to avert a climate crisis, the latest IPCC report says.

GETTING BIGGER, MAYBE  Scientists disagree about whether a Homo erectus boy from 1.5 million years ago, represented here by a cast of the child’s skull, had a modern, humanlike teenage growth spurt.



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