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  1. Health & Medicine

    Diluted smallpox vaccine is potent

    About 15 million doses of smallpox vaccine held by the U.S. government can be diluted to one-tenth their original concentration and still be effective for immunizing people.

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  2. Plants

    Trees dim the light on spring flowers

    Early spring flowers and the sugar maples they grow under use different alarm clocks to get going in the spring, which can make life hard for the flowers in northern forests.

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  3. Health & Medicine

    Pulse pressure linked to dialysis death rate

    People on kidney dialysis who have high pulse pressure—the difference between the top and bottom numbers on a blood pressure reading—seem to be at a greater risk of dying than those with low pulse pressure.