The PBS series NOVA scienceNOW returns to television and the web this fall with a new host, astrophysicist Neil deGrasse Tyson, and several new topics of exploration--from whether a "doomsday asteroid" the size of the Rose Bowl will hit Earth in 2036, to why most attempts at dieting prove so frustrating. At the series' web site, students and teachers can watch streaming video of past programs, download podcasts, and get the latest information about upcoming segments, science in the news, and the facts behind the headlines--all of which can be delivered right to subscribers' desktops free of charge through an


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