He started his streak in January and February, casually proving Newton wrong and saying that space and time are not absolute, thus coining the theory of special relativity. In March, Einstein came up with quantum theory, a.k.a. the one about light being all about tiny particles that would eventually become known as photons. Finally, between April and May, he published a couple of papers that proved the thus far impossible-to-verify existence of the atom.
At that point, most of us would have whipped out our sunglasses and ridden into the sunset. Einstein, on the other hand, just pushed on, adding more layers to his theories about light and, finally, creating a little formula regarding the equivalence of energy and matter that you might have heard about:
As made famous by the Animaniacs.
For no-shit-related reasons, the year is now known in physics circles as Annus mirabilis, the Miracle Year. But really, the most impressive thing about it was that Einstein somehow managed to pull this all off at an age, when most of us still can't say with any certainty what we want to be when we grow up.