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。
"The study of computational complexity teaches us that some problems are inherently difficult, no matter how clever our algorithms are."
The world is so unpredictable. Things happen suddenly, unexpectedly. We want to feel we are in control of our own existence. In some ways we are, in some ways we're not. We are ruled by the forces of chance and coincidence.
The future of manufacturing lies in closed-loop systems.