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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. 

LAND LINK  Paleobiologist Neil Shubin hosts the new PBS series Your Inner Fish, exploring humans’ connections to animal ancestors. He holds an example of his most famous fossil find: Tiktaalik roseae, an evolutionary link between fish and land animals.

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.

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.  

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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