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EarthDo 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.
By Janet Raloff -
Health & MedicineDiluted 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.
By John Travis -
PlantsTrees 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.