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  1. Blue light keeps night owls going

    A study of nine young men suggests that blue light is more effective than yellow at beating back sleepiness and muting key physiological changes that normally occur in late evening.

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  2. Planetary Science

    A moon with atmosphere

    Magnetic measurements by the Cassini spacecraft have revealed that Saturn's moon Enceladus has a tenuous atmosphere containing water vapor.

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  3. Earth

    Blowflies shed mercury at maturity

    Blowflies that absorb mercury from fish carcasses they feed on as larvae rid themselves of much of that toxic metal when they become adults.

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  4. 19540

    This article gives the casual reader the distorted view that one could travel the solar system at will by using these methods.