This Terri Gross interview with Washington Post reporter Barton Gellman on WHYY’s “Fresh Air,” which is syndicated by NPR, is really terrific. I caught it while driving home yesterday, and had a genuine “driveway moment” — I sat in my car a good 15 minutes after I parked to hear the whole thing. Gellman speaks about the process of reporting on Edward Snowden’s leaks about the NSA’s spying programs. What he says is as interesting as what he can’t.