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  1. Health & Medicine

    A new treatment could restore some mobility in people paralyzed by strokes

    Electrodes placed along the spine helped two stroke patients in a small pilot study regain control of their hands and arms almost immediately.

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  2. Readers ask about fungal lung infections

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  3. How the science of rocks is like the science of humans

    Editor in chief Nancy Shute examines how a simple question can lead to a complex search for answers in both geology and human psychology.

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  4. Space

    What has Perseverance found in two years on Mars?

    NASA's Perseverance rover has turned up volcanic rocks, signs of flowing water and some of the materials necessary for life.