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  1. Protein may help the eyes tell time

    A human version of melanopsin, originally found in the skin, eyes, and brains of frogs, has been discovered in the inner retina and may be the long-sought photoreceptor for the human biological clock.

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  2. Astronomy

    A chance to point Hubble

    Get out your heavenly wish list: Astronomers working with the Hubble Space Telescope are soliciting suggestions for where to point the orbiting observatory this summer.

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  3. Astronomy

    A possible signal from Polar Lander

    Astronomers may have heard a faint signal from the vanished Mars Polar Lander spacecraft last month but, as of mid-February, have not detected another.

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  4. 19105

    As a trainer of tracking dogs, I was interested in your article about attempts to duplicate electronically the scenting ability of dogs. Even if these expensive, high-tech artificial dog noses are successful, however, they are not likely to be of much benefit to the “62 countries worldwide” strewn with “more than 100 million land mines.” […]

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  5. Tech

    Eau, Brother!

    The combination of advanced sensor materials and powerful computer chips promises devices that can sense threats ranging from bacteria in food to explosives in land mines.

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  6. Physics

    Hunting for Higher Dimensions

    Inspired by recent theoretical insights, physicists at accelerators and gravitational laboratories are searching for clues to dimensions beyond the four dimensions of space-time.

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  7. Health & Medicine

    Pancreatic enzymes may play role in shock

    Pancreatic enzymes used for digestion may cause shock when they leach out of the small intestine and form a substance that activates white blood cells.

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  8. Testosterone shows hurtful, helpful sides

    A small but significant portion of men taking large doses of testosterone experience mania, although moderate doses of the male sex hormone show promise in boosting the mood and sex drive of HIV-infected men.

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  9. Chemistry

    Volcanoes aren’t a big source of CFCs

    Ozone-depleting chlorofluorocarbons in the atmosphere come mainly from human-made sources, not from volcanoes as some have suggested.

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  10. Planetary Science

    Tryst in space: Craft, asteroid rendezvous

    On Valentine's Day, the NEAR spacecraft cozied up to the asteroid 433 Eros, becoming the first craft to orbit a tiny body.

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  11. Fly naps inspire dreams of sleep genetics

    Researchers have discovered a sleep-like state in the fruit fly.

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  12. Physics

    Melting nuclei re-create Big Bang broth

    The seething primordial matter that existed in the first microseconds after the Big Bang may have briefly reappeared in fireballs created at a European particle accelerator.

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