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  1. Paleontology

    Groovy 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.

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  2. Health & Medicine

    Heartfelt 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.

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  3. 19515

    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.