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The activity of just a few genes may be key to limb evolution. Read “Fins to limbs with flip of genetic switch.”

Scientists analyze chemical forms in gorilla poop to reconstruct monthly shifts in the animals’ diets. See “Feces study gets the poop on gorillas’ diet.”

New satellite images dubbed “Black Marble” show nighttime lights across the globe. See “Earth in the black.”

A nearby sunlike star may host five planets that weigh between two and six Earth masses. Read more in “Possible planet looks habitable.”

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