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Nobel laureate Peter Agre surveys some examples of pressing problems in the United States and around the world arising from threats to water supplies.
Ira Lamster, Dean of the Columbia University College of Dental Medicine, describes the challenges of delivering good oral care to older patients, and why integrating medicine and dentistry can improve patients' overall health.
Ralph Steinman received the 2007 Lasker Award in honor of his discovery of the dendritic cell, a critical component of the immune response. Here he describes his finding and its ongoing implications for research into cancer and immunology.