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  • Slick ice covers a footpath, reducing friction and making walking more dangerous. Bo Persson, a scientist at the Jülich Research Center in Germany, has developed a new theory to describe ice friction.
    Simon A. Eugster via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Black_ice_on_footway.jpg)
    Slick ice covers a footpath, reducing friction and making walking more dangerous. Bo Persson, a scientist at the Jülich Research Center in Germany, has developed a new theory to describe ice friction.
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