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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.

    By Nathan Seppa
  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.

    By Susan Milius
  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.