Hydrogen. Now why, you say, would I choose little old hydrogen?
Well, first off, hydrogen is explosive, so me makum big booms...
Second, hydrogen is a fuel...so me makum big bucks and big zoom-zooms (I have no clue why I am talking like this...)
Third, hydrogen metal. Yep. Scientists say that most hydrogen in the universe is actually hydrogen metal (if you look at a periodic table, you will see that it is with the metals on the left, and not other gases, on the right). As a metal, they say that it is ten times lighter than steel and ten times stronger (thus, 100x improvement over steel) AND its a superconductor at room temperature (infinitely small wires can carry infinitely large electrical loads, and store them infinitely, and release them in infinitely small [or large] bursts). Thus, me makum super-awesomeness editions of EVERYTHING, and me makum more big bucks, and me controlum electricity and magnetism.
So, how do you like them apples?