Even in the PC space, however, some think Valve will need to grow beyond its core demographic of male gamers who download full PC games.

FORBES: Valve And Steam Worth Billions

That thinking changed on March 28, 1979, when a small valve stuck open, cooling water escaped and the reactor core of TMI's Unit 2 began to melt.

CNN: Three Mile Island, 20 years later

In April 2009, a control rod the shutdown device used to stop the nuclear reaction in a plant's core malfunctioned in Reactor No. 3 due to a leaking valve.

WSJ: Japan Plant Had Troubled History