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  1. Earth

    Do your bit to fight toxic pool pollution

    New data suggest that showering before a swim in the community pool could help limit the formation of toxic chemicals in the water.

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  2. 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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  3. 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.