I just saw this article referenced on CNet and I can't believe its getting as much attention as it is. It doens't make any real conclusions. Yes sperm production is ideal over a narrow temperature range. But I don't see how using a laptop is much more different than spending some time in the spa, wearing tightey whiteys or living in Arizona during the summer (or winter for that matter). Your sperm may be less than ideally fit in these cases, but probably only in their motility. I don't know of any evidence that proves temperature to be the cause of errors in DNA replication in the germ line (what's really important). Besides, I would also assume that burning pain in balls would precede any permanent tissue damage. I don't know about everyone, but if my scrotum starts to hurt, I won't leave my laptop there for very long.