Sure, they've got a flashy medal to hang on the wall, but how much do those Nobel winners really know? The Exploratorium in San Francisco is giving you a chance to test the intellectual mettle of a group of laureates during a live Webcast on Saturday, 27 October. Log in at 1 p.m. Pacific time to watch Nobelists such as Douglas Osheroff, the 1997 winner in physics, grapple with questions submitted by a live audience and by viewers on the Web. Part of a 2-day commemoration of the centennial of the Nobel Prizes, the Webcast will also feature laureates explaining the science underlying some of the museum's exhibits. E-mail your puzzlers to.