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Humans & Society

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images of plastic, nuclear tests, chickens

END OF AN EPOCH  Plastics, radioactive fallout and the prevalence of domestic animals such as chickens — signs of which show up in the sedimentary record — have made the last few decades distinct in the planet’s stratigraphic record, a group of researchers say.

human embryo

EDITS UNDER WAY  Researchers in Sweden have begun editing genes in viable early human embryos (four-cell stage, shown). Others are probably doing the experiments behind closed doors, scientists say.

computer simulation of ancient climate

GRAND OPENING  A computer simulation of ancient climates predicts that people most likely left Africa about 80,000 to 100,000 years ago. That’s earlier than geneticists estimate by 10,000 years or more.

Humans & Society

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