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  1. Night of the Crusher

    Sleep paralysis, a kind of waking nightmare experienced by people in all cultures, sometimes plays a key role in post-traumatic stress disorder and panic attacks and contributes to widespread beliefs in various spirits and supernatural beings.

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  2. Earth

    Volcanic Hot Spots

    Many geophysical studies, including analyses of deep-traveling seismic waves and computer simulations of flowing molten rock deep beneath Earth's crust, are providing evidence that mantle plumes actually exist.

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  3. Humans

    From the June 29, 1935, issue

    Science and engineering in a photo-mural, organs grown outside the body, and inexpensive air conditioning.

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  4. Humans

    Evolution at the Academies

    The National Academies have unveiled a new resource for the public on evolution.