弦理论的景观是广阔而复杂的，可能有10^500个不同的可能宇宙。
The landscape of string theory is vast and complex, with perhaps 10^500 different possible universes.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
Global challenges require global solutions.
The teacher must believe in the potential of his students. He must see in each one of them a spark of the divine fire.
A book should feel like a friend to a child—comforting, exciting, and full of surprises.