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  1. Health & Medicine

    Have a heart: Turn on just a single gene

    One gene appears to act as the master switch in embryonic heart formation.

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  2. 18955

    I am writing to correct a significant inaccuracy in your recent article “Landfills make mercury more toxic.” As a member of the National Research Council’s committee that produced the report you cite, I feel obligated to correct your statement, attributed to that report: “Some 60,000 U.S. children are born with developmental impairments triggered by fetal […]

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  3. Earth

    Landfills Make Mercury More Toxic

    Landfill disposal of mercury-containing products can chemically transform the pollutant not only to make it more potent but also to foster its release into air.