The most important innovation to me is something that was around even when egyptians were alive – Math. The one that thought of math created many branches and it is exists in every object in the world. As math grow, logic comes forth, creating what the world is now.
I might not be the math freak, but I realize the importance of it in this world. I has brought other understandings and ease our work. Even computer are build by math. A simple math could build a pyramid; integral build many more.