I'm not a light, I'm a darkness.
The greatest problem for mathematicians now is probably the Riemann Hypothesis.
除了诱惑之外,我可以抵抗任何事物。
我不是悲观主义者,我是一个受过悲观主义训练的乐观主义者。
Randomized evaluations can help us understand what works and what doesn't in development.