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  1. Life

    Mature females key to beluga sturgeon survival

    Hatchery fish are unlikely to restore caviar-producing fish populations, a new assessment finds.

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  2. Psychology

    Alcohol distills aggression in large men

    A new study suggests that the ‘big, mean drunk guy’ stereotype contains some truth.

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  3. Space

    Geophysicists push age of Earth’s magnetic field back 250 million years

    South African rocks suggest that the earliest stages of life on Earth were protected from harmful solar radiation.

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  4. Earth

    Arctic seafloor a big source of methane

    Measurements show that Arctic undersea methane deposits, previously thought to be sealed by permafrost, are leaking into the atmosphere.