"She was free in her wildness, she was a wanderess, a drop of free water. She belonged to no man and to no city."
可能近似正确（PAC）学习的概念在计算学习理论中具有基础性意义。
We are going to die, and that makes us the lucky ones. Most people are never going to die because they are never going to be born.
Inflation is a very bold idea, but it seems to be the only way to explain the observed features of the universe.