Open Source discussion on Talk of the Nation Science Friday, today at 1:00 p.m. You can listen on 89.3 KCUR, or at kcur.org: http://discover.npr.org/rundowns/rundown.jhtml?prgId=5&prgDate=current » Gene Therapy/Open Source Software This week the FDA put several gene therapy trials on hold, following the announcement that two participants in similar trials had developed leukemia. Join host Ira Flatow and guests to discuss the status of gene therapy research. Plus, we'll be taking a look at the philosophy -- and business -- of open source software. Guests: Joseph Glorioso *President, American Society for Gene Therapy *Director, University of Pittsburgh Human Gene Therapy Center University of Pittsburgh School of Medicine, Pittsburgh, Penn. Bruce Perens *Computer Scientist and Linux developer, Berkeley, Calif. Michael Robertson *Founder and CEO Lindows.com, San Diego, Calif.