Imagination is the beginning of creation. You imagine what you desire, you will what you imagine, and at last, you create what you will.

I'm interested in the weak materials, the materials that people don't think can be used for permanent structures.

The labor which it would require to make a single one of these guns by hand would exhaust the patience and perseverance of any ordinary workman.

广义相对论可能是所有现有物理理论中最美的。

生活要么是一场大胆的冒险，要么什么都不是。