The true cost of searching for aliens

If you ever wondered just what it takes to look for aliens, then prepare to get informed. Sure, you might imagine it doesn't take much more than hooking up a load of computers to form a gigantic zombie network which, for a change, does not use spare CPU cycles to send spam. Indeed, the SETI@home project has been doing this for years by listening to space and scanning what it hears for signs of alien life.