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PaleontologyGroovy Bones: Mammalian ear structure evolved more than once
Fossils of an ancient egg-laying mammal indicate that the characteristic configuration of the bones in all living mammals' ears arose independently at least twice during the group's evolution.
By Sid Perkins -
Health & MedicineHeartfelt Fear: Findings link stress and cardiac symptoms
Emotional stress can lead to symptoms that mimic a heart attack, even in people without coronary artery blockages, possibly by causing an unusual secretion of hormones.
By Nathan Seppa -
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On reading about the interesting research on droplets in this article, I noticed that the two droplets shown in the photos at the moment of first contact have different shapes.