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Genetics

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brushtail possum

SO CUTE, SO WRONG  No one has a genetic way of getting rid of invasive brushtail possums (shown) in New Zealand, but now is the time to debate whether CRISPR gene drives are too strong to be considered, two researchers argue.

map of Yamnaya migrations

BIG MOVES  Ancient DNA indicates horse-riding pastoralists called the Yamnaya made two long-distance migrations around 5,000 years ago. One trip may have shaped Europe’s ancient Corded Ware culture, while the other launched central Asia’s Afanasievo culture.

European skull

MIXED ANCESTRY  Tiny samples taken from ancient European skulls, in a process shown here, yielded enough DNA for researchers to determine that farmers and foragers interbred in three different regions from 8,000 to nearly 4,000 years ago.

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