My dad was my best friend and greatest role model. He was an amazing dad, coach, mentor, soldier, husband and friend.
For every expert there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact.
Action and knowledge are not obstacles to each other.
计算复杂性的研究告诉我们，有些问题本质上是困难的，无论我们的算法多么聪明。