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  1. Health & Medicine

    First brain image of a dream created

    Feat opens the door to probing the stuff of nocturnal dramas.

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  2. Cornell project brings peregrines back to the eastern United States

    With a little help, peregrine falcons make a comeback from the devastating effects of DDT.

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  3. Letters

    Defining the human species Having read “Humans benefited by interbreeding” (SN: 10/8/11, p. 13), I wonder if I have missed what, to me, seems a major change in the definition of “species.” I was taught that the attempted crossbreeding of animals of two different species could result in either no offspring or sterile offspring. If […]

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  4. SN Online

    LIFE Cycads, often called “dinosaur plants,” aren’t so ancient after all.