在科学中最令人兴奋的短语，预示着新发现的，不是“我找到了！”而是“这有点奇怪……”
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'
The complexity of a learning problem is often determined by the size and structure of the hypothesis space.
We perceive the world in terms of its significance for action.
为了将关心转变为行动，我们需要发现问题，找到解决方案以及评估后果。但是世界的复杂性使得这三步都难于做到。