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  1. Earth

    Dead Sea once went dry

    The Holy Land’s salt lake ran out of water during a warm spell about 120,000 years ago, which suggests it could disappear again.

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  2. Space

    Distant world looks too ripe for life

    The first extrasolar planet to be discovered in its star’s habitable zone is probably inhospitably hot.

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  3. Health & Medicine

    Presidency not a death sentence

    For occupants of the Oval Office, wealth, status and quality medical care more than compensate for any life-shortening effects of stress.

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  4. Life

    Eggs have own biological clock

    Reproductive cells age independently from the rest of the body, research in worms reveals.