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LINDAU, Germany--There's a magazine ad for an expensive skin care product marketed by Christian Dior that claims to trade on aquaporins, the discovery of which by Peter Agre won him the Nobel Prize in chemistry in 2003 (he shared it with Roderick MacKinnon).

Editor's Note: The following blog post first appeared May 19 on the World Science Festival's Web site. Most people look for the key to postponing old age in mega-antioxidant-loaded juices, extreme exercise regimens, or expensive skin creams