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Genetics

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 Man Bac archaeological site

CHINA TIES  Excavations at Vietnam’s Man Bac site, including this work in 2007, uncovered skeletons of farmers from around 4,000 years ago. DNA from these skeletons supports an idea that ancient migrants from southern China spread farming and languages throughout much of Southeast Asia.

red-eared slider turtle

TURTLE TRICK  Scientists have identified a gene in the red-eared slider turtle, shown here, that makes embryonic turtles turn male or female depending on nest temperature.

shark

SHARK SIGNS  A baited camera lures a tiger shark and gray reef shark into view, as part of a test to compare what works better to census the elusive fishes: cameras, divers or collecting DNA from seawater. 

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