I don't believe in over-diversification. I prefer to focus on a few good ideas.

矿工的安全永远不应该用成本效益分析来衡量。

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

每个孩子都应该在他们读的故事中看到自己。