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  1. When brains wring colors from words

    Brain-scan data indicate that one type of synesthesia, in which people involuntarily see vivid colors while listening to spoken words, is more like a color hallucination than an attempt to imagine colors.

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  2. Clones face uncertain future

    Scientists have cloned a cat, but new studies suggest that cloned animals have shortened lifespans.

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  3. Physics

    Computer simulates full nuclear blast

    In a classified nuclear-weapon experiment, the world's fastest computer simulated a thermonuclear blast in three dimensions.

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  4. Math

    Highway Relativity

    There may be more to zipping along in the fast lane than meets the casual eye.