唯一真正的进步在于学会独自犯错。

In my solitude of heart I feel the sigh of this widowed evening veiled with mist and rain.

我们成功的真正标准是我们如何改善全球健康结果。

"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."

We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.

Every ton of coal we extract must create maximum value with minimum environmental impact.

对未知的恐惧是一切智慧的开始。