Earth

  1. Life

    Life on Earth took a licking, kept on ticking

    Earth's early organisms may not have had to restart after a long spell of asteroid impacts.

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  2. Chemistry

    BPA: On the way out? Sort of

    Half-hearted bans won't really protect babies, much less the rest of us.

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  3. Psychology

    School-age lead exposures most harmful to IQ

    New studies find lead exposure has greater potency in school-age children than in infants and toddlers, including effects on brain volume.

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  4. Chemistry

    Nonstick chemical pollutes water at notable levels

    Residues of nonstick chemicals — from unknown sources — appear to be approaching concentrations associated with adverse effects in laboratory animals.

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  5. Animals

    Controversial polar bear rule stands

    Creature’s plight remains separate from decisions on greenhouse gas emissions.

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  6. Earth

    Federal budget’s new ‘black book’

    The administration details a proposed $17 billion in budget savings in a new book.

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  7. Earth

    U.S. radiation dose has doubled

    New analysis finds radiation-based medical procedures have skyrocketed.

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  8. Earth

    Report of earlier, longer puberty in girls

    A Danish study finds young girls are entering puberty notably earlier than 15 years ago — for reasons that remain unknown.

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  9. Health & Medicine

    Science budgets look rosy, AAAS finds

    The president and Congress have collaborated in targeting substantial increases for federal investments in R&D this year.

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  10. Climate

    On federal science — and science spending

    Things you might have gleaned at the AAAS Forum on Science and Technology Policy.

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  11. Earth

    A limit for carbon emissions: 1 trillion metric tons

    To reduce risks of severe damage from climate change, humans should burn no more than 1 trillion tons of carbon in total, researchers suggest.

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  12. Plants

    Climatic effects of tree-killing hurricanes

    A new analysis suggests storm damage returns millions of metric tons of carbon dioxide to the atmosphere each year.

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