数学的真正力量不在于它的复杂性,而在于它的简洁和优雅。
If you believe that every life has equal value, it's revolting to learn that some lives are seen as worth saving and others are not. We said to ourselves: "This can't be true. But if it is true, it deserves to be the priority of our giving."
I don't need a reason to be proud of myself.
成本不是为了计算而存在的,而是为了被降低而存在的。