NOVA scienceNOW producer Chad Cohen describes a new study that may link longevity to a gene controlling a certain type of cholesterol. Produced by Chad Cohen and Lexi Krock. Audio editing by David Levin. Interviews conducted by Chad Cohen. NOVA is produced by WGBH in Boston. Major funding for NOVA scienceNOW is provided by Pfizer, the National Science Foundation, the Howard Hughes Medical Institute, the Alfred P. Sloan Foundation, and public television viewers. This material is based upon work supported by the National Science Foundation under Grant No. 0229297. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. For more fun science stories, visit our Web site at http://www.pbs.org/nova/sciencenow Less