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The flatworms that cause the tropical disease schistosomiasis can live and reproduce inside infected humans for decades. In a new study, researchers identified the stem cells that may be responsible.

This links to the New York Times map: "Some Places Are Riskier Than Others." It maps the places in the U.S. that are at greatest risk of being affected by natural disasters.

Cover art of "Petrochemical America"

Pipeline companies are exploring new lines to get Canadian crude to market. There have already been a number of devastating tar sands spills from existing pipelines. Tar sands are extremely toxic. And the use of tar sands poses a grave threat to our human-friendly climate.

US greenhouse gas emissions (2011) by type

Global greenhouse gases contributions by source