We should expect viruses to be a large source of our genetic material, simply because they have access to it. Viruses are all about penetrating into DNA and modifying it. If the host subsequently reproduces, those modifications could be passed on. Each such modification could: * Be useless junk dna * Be generally useful. Does it matter where good ideas come from? * Be harmful, maybe even make descendants more susceptible to attack from the original virus. * Allow descendants to better identify and defend against that attacker, AKA counterintelligence.

LaLa started up several years ago as a used CD trading business. When a member receives a CD they request, the use up a credit. When a member ships a CD to any requester, they get a credit. LaLa gets $1 fee (+$0.75 shipping) per trade. LaLa provides all the envelopes and cardboard sleeves. It's a great service. I've traded hundreds of unwanted CDs for CDs I do want. Of course, nothing stops you from ripping a CD before passing it along. I guess that business model wasn't as profitable as LaLa hoped, so they switched to offering a rent-a-song-music-locker concept. Now they only market the rent-a-song and don't even admit they still run the CD trading service. I suggest you join LaLa, but don't pay a dime for rental. Opt in for trading CDs, rip away, and screw the RIAA.