The key to good design is understanding forces.

The downside of my celebrity is that I cannot go anywhere in the world without being recognised. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away.

The truth is rarely pure and never simple.

量子力学的挑战不在于它的复杂性，而在于它的简单性——它迫使我们重新思考关于宇宙的最基本假设。