[Tony shakes his head.] I did for a while, until Extremis repaired my heart. But mine was... Sort of a much, much simpler version of this. It ran off the some of the same fundamental tech as what I used to power my suits, but nowhere near as powerful. I don't know why you would put one of these in your chest - that's like putting a fusion reactor engine in a Hot Wheels car. Yeah, it'll run your heart - for about a thousand years. Jeez. Talk about overkill.