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  1. Health & Medicine

    New brain cell growth restores function

    Regeneration in the hippocampus helps repair learning and memory after injury, mouse experiments suggest.

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  2. Humans

    Climate meddling dates back 8,000 years

    Cutting down trees put lots of carbon into the atmosphere long before the industrial revolution began.

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  3. Space

    Atom & Cosmos

    Dead stars may actually be a good place to hunt for life, plus organic-free asteroids and watery comets in this week’s news.

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  4. Life

    DNA flaws can stack up as cancer grows

    Acute myeloid leukemia progresses by accumulating various mutations, according to an analysis of one man’s disease over time.