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  1. Earth

    Climate fix could deplete polar ozone

    Scientists seeking to cool Earth’s climate by injecting sulfuric acid droplets high in the atmosphere might trim rising temperatures but could also destroy much of the ozone in polar regions, a new study suggests.

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  2. Health & Medicine

    Pockets of poor health

    Life expectancy decreases in some locations

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  3. Health & Medicine

    New approach might strike at the core of Alzheimer’s disease

    By finding a way to stick an enzyme-inhibiting molecule to the membrane of a cell, scientists may have devised the framework for an Alzheimer’s drug.

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  4. Humans

    Incan skull surgery

    Incan healers became highly adept at skull surgery techniques that developed over thousands of years in ancient Peru.