每一次失败都离答案更近一步。

The poor often lack the information needed to make good choices, and when they do have it, they often don’t trust it.

估计问题的性质不同。在这里，我们不关心检验特定的假设，而是关心估计参数的值。

死亡有它的启示：巨大的悲伤会打开心扉，也会打开头脑。