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  1. Earth

    When the Great Lakes were lower

    New archaeological evidence shows signs of prehistoric hunting and other human activities on now-submerged portions of Lake Huron.

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  2. Physics

    Friction gives snakes a smooth slither

    Combination of friction and push propels snakes forward on flat surfaces.

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  3. Humans

    Children get social with virtual peers

    Life-size 3-D versions of children can draw kids with autism into social encounters and more news from the annual meeting of the Jean Piaget Society in Park City, Utah, June 4-6.

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  4. The iron record of Earth’s oxygen

    Scientists are decoding the geological secrets of banded iron formations.