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  1. Humans

    From the January 29, 1938, issue

    A new telescope's home under construction, Eros makes a close pass, and history revealed in mosaic floors.

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  2. Be a Cognitive-Test Subject

    You can become an online participant in tests of how the mind uses and processes words at this several-month-old site, administered by Harvard University’s Cognition and Language Laboratory (with collaborators at other institutions). Alternatively, you can just read the results from earlier experiments. They’re quick, fun, and sometimes embarrassingly challenging. Go to: http://coglanglab.org

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  3. Health & Medicine

    Warning Sign: Genetic fragments tag cancer severity

    High levels of the microRNA miR-21 lead to poor prognoses for colon cancer patients.