Stark's ticket to movie science credibility was actually located in his chest: A tiny, stable, almost limitless energy source. So powerful it can do the job of massive generators and jet engines simultaneously, and can go years without refueling. So simple it could be slapped together out of spare parts by two guys in a cave.
It's the miniature arc reactor, a device that by all rights should've revolutionized the world. Give the man a Nobel Prize!
Why He Should Not Have Been Allowed To Do Science:
The more you look at Tony Stark, the more you realize he developed the mini arc reactor only to play God, or at least a shitfaced version of Shaquille O'Neal's Steel.
We'd so pay to see that movie.