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illustration of ancient earth

DIM SUN  Scarce oxygen and abundant sulfate prevented methane concentrations from getting high enough to explain why Earth didn’t freeze over around 1.8 billion to 800 million years ago when the sun was dimmer, 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.

grolier codex

GENUINE GODS  A book called the Grolier Codex — long regarded as a fake by some scientists — may be the oldest known manuscript of ancient America. Deities depicted on the book’s 10 surviving pages include a death god with a decapitated captive (left) and a bird/serpent god.



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