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  1. Animals

    Readers fascinated by critters’ strange biology

    Readers responded to fish lips, monkey brains, sunless tanner and more.

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  2. Animals

    Ticks are here to stay. But scientists are finding ways to outsmart them

    Researchers acknowledge that there’s no getting rid of ticks, so they are developing ways to make them less dangerous.

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  3. Animals

    Fossil find suggests this ancient reptile lurked on land, not in the water

    An exquisitely preserved fossil shows that an ancient armored reptile called Eusaurosphargis dalsassoi wasn’t aquatic, as scientists had suspected.

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  4. Psychology

    A look at Rwanda’s genocide helps explain why ordinary people kill their neighbors

    New research on the 1994 Rwanda genocide overturns assumptions about why people participate in genocide.