On: Do you know how much your computer can do in a sec...

[cowsandmilk]

boinc, folding@home, gimps, etc. have all done this for over a decade.

[fho → cowsandmilk]

Thing is that when boinc and co were popular all those cycles were really wasted. Today computers just enter power-saving states when not in use saving electricity and in effect money.