Why Tony Stark no longer needs the Arc Reactor Another major plot point of the ending of Iron Man 3 revolves around Tony's decision to have surgery to remove the shrapnel from his chest.

The closing scene of Iron Man 3 features Tony disposing of the most recent Arc Reactor, throwing it off the cliff where his house used to be. It's an incredibly symbolic moment, as he's letting go ...

He’s even building it into a 3D printed Iron Man helmet, with the NVIDIA Jetson board that’s powering the show inside a chest-mounted “Arc Reactor”. He goes into a bit more detail about ...