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  1. Health & Medicine

    Lack of Evidence: Vaccine additive not linked to developmental problems

    Thimerosal, a mercury-containing vaccine preservative, shows no signs of causing memory, attention or other problems in children.

    By Brian Vastag

  2. Bugs in Space: Genes explain why salmonella grow deadlier when freed from Earth’s gravity

    Bacteria that flew on a space shuttle became deadlier than their earthbound counterparts.

    By Sarah Williams

  3. Double Trouble: Tumors have two-pronged defense

    By depleting an essential amino acid and releasing a toxin, cancer cells can ward off attack by the immune system.

    By Patrick Barry

  4. Jungle Down There: What’s a kelp forest doing in the tropics?

    Kelp, algae that grow in cold water, turn out to be surprisingly widespread in tropical seas.