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  1. Health & Medicine

    Circadian Fix: Viagra may lessen effects of jet lag

    Sildenafil, the male-impotence drug marketed as Viagra, helps laboratory rodents recovery from circadian disruptions similar to jet lag.

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  2. Animals

    Virgin Birth: Shark has daughter without a dad

    DNA testing of two sharks confirms an instance of reproduction without mating, adding a fifth major vertebrate lineage to those known for occasional virgin births.

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  3. Planetary Science

    Violent Past: Young sun withstood a supernova blast

    A big bully pummeled the infant solar system, first by blasting it with a massive wind, then by exploding nearby, driving shock waves into the fledgling solar system and irrevocably altering its chemistry.

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  4. Physics

    The dance of the electron spins

    Physicists have used a novel measuring technique to track the motions of electron spins in a tiny magnet as its polarity flips, with north and south poles changing places.

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  5. Chemistry

    Onward, microbes

    With a tweak to their genetic codes, bacteria have been coaxed to follow a chemical trail of a researcher's choosing.

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  6. Health & Medicine

    Nail-gun injuries shoot up

    Nail-gun injuries among do-it-yourself carpenters have tripled since 1991.

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  7. Unintended consequences of cancer therapies

    Radiation and chemotherapy can destroy a tumor, but they may also indirectly promote metastasis, the spread of cancerous cells to other organs.

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  8. Synesthesia tied to brain connections

    People who see specific colors when looking at particular letters possess an unusually large number of connections in brain areas that influence word and color perception.

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  9. Earth

    Southern seas slow their uptake of CO2

    In recent decades, the rate at which oceans in the Southern Hemisphere soak up atmospheric carbon dioxide has slowed.

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  10. Anthropology

    When female chimps become baby killers

    Although long thought to be rare, instances in which female chimps band together to kill other females' infants occur fairly regularly under certain circumstances.

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  11. 19837

    As I read this article, I wondered if the sex of the killed infant was determined. In a troop characterized as having a disproportionate number of females, could it be that the chimps are selectively killing females in an attempt to balance sexes in the group? Eliza GouverneurPrinceton, N.J.

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  12. 19836

    This article states that although men who suffer from migraines are more likely to experience heart attacks, scientists have failed to find a biological mechanism linking them. Such a link seems to be suggested in an earlier Science News article, “A Gasping Heart” (SN: 4/7/07, p. 218), which states that a patent foramen ovale is […]

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