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  1. Math

    Math Circles Inspire Students

    Programs outside of school are helping students discover math on their own.

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  2. The Billion Tree Campaign

    The United Nations Environment Programme has launched a major global tree-planting campaign to encourage people, businesses, and governments to enter tree-planting pledges online. The effort’s objective is to plant at least one billion trees worldwide during 2007. Go to: http://www.unep.org/billiontreecampaign

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  3. Humans

    From the March 27, 1937, issue

    A lily's inner beauty, and the need for science education.

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  4. Earth

    Pollution Fallout: Are unattractive males Great-gram’s fault?

    Pollutant exposures in rodents can have behavioral repercussions that persist generation after generation.