From this Learning from Seymore Papert talk:
The children are not going to be able to invent Calculus. It took a genius and two hundred thousand years for that to happen. But in fact, another genius, Seymore [Papert] can figure out a way of contextualizing the important ideas of this so it fits perfectly into the child's world. That changed my life forever. Because once you see that done, it's kind of a duty thereafter to try and make it happen.
- Alan Kay