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  1. Math

    A Tangled Tale

    A piece of string tumbled over and over quickly develops knots, explaining why your headphone cords are always in a tangle.

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  2. Spying Vision Cells: Eye’s motion detectors are finally found

    Primates, like other mammals, possess specialized retinal cells that detect motion.

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  3. Paleontology

    Fossil mystery solved?

    Experiments in a Florida swamp show how aquatic creatures can get trapped and preserved in amber, a form of hardened tree sap.

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  4. Humans

    Mice, Magnetism, and Reactions on Solids

    The 2007 Nobel prizes in the sciences recognized research in genetics, materials science, and surface chemistry.