Newton's three laws, the universal law of gravitation, the reflecting telescope to check his work, and optics, and all this crazy stuff in that two years that he had stopped learning.

牛顿三大定律，万有引力定律，用反射式望远镜来验证他的假设， 还有光学相关的，在他停止学习的那两年中， 做了所有这些看似疯狂的事。