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  1. Potent Promise: Essential Stemness

    Scientists move closer to understanding the dual fates of embryonic stem cells — to divide or develop.

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  2. Physics

    It’s Likely That Times Are Changing

    A century ago, mathematician Hermann Minkowski famously merged space with time, establishing a new foundation for physics; today physicists are rethinking how the two should fit together

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  3. Potent Promise: Back to the Womb

    Reverting adult cells to an embryonic state without creating embryos is a tricky business.

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  4. Earth

    Ice spy

    Radar altimeters on Earth-orbiting probes can detect and count small icebergs even under cloudy skies, providing warning to ships and invaluable data for scientists monitoring climate change.