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Genes & Cells

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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.

peanut butter and jelly sandwich face down on the floor

DON’T EAT THAT  Wet foods that fall on the floor pick up bacteria quickly, a new study suggests.

muscular legs of a bicyclist

SHORT-TIMERS  Endurance exercises like cycling, running and swimming change muscles for the better, but the body may not remember those changes in the long run. 

Genes & Cells

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