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  1. Health & Medicine

    Born to Heal

    The controversial strategy of screening embryos to produce donors for siblings raises hopes and presents new ethical dilemmas.

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  2. Math

    Mining the Tagged Web

    IBM's WebFountain project gathers and annotates Web content on a vast scale to serve as a platform for data miners.

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  3. From the March 3, 1934, issue

    High winds atop Mt. Washington, a new tool for brain studies, first chemical proof of the artificial transmutation of elements.

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  4. National Pi Day

    National Pi Day—March 14—is a time to celebrate the number 3.14159. . . . Take a look at how this remarkable number has been honored in various settings, from a middle school classroom to the Exploratorium and Harvard University.