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  1. Earth

    Salmon hatcheries can deplete wild stocks

    Hatchery fish appear to be replacing wild salmon populations in the Columbia River.

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  2. Planetary Science

    Asteroid Eros poses a magnetic puzzle

    Measurements with a magnetometer aboard the NEAR-Shoemaker spacecraft a few days after it landed on the asteroid 433 Eros confirmed a major puzzle: The rock has no detectable magnetic field.

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  3. Insects deploy sticky feet with precision

    Sticky ant and bee footpads retract and unfold in time with insect steps, so the insects don't trip over their own sticky feet.

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  4. Health & Medicine

    Does breast-feeding accelerate AIDS?

    A study of HIV-infected mothers in Kenya suggests that breast-feeding places them at a health risk.