自然实验可以为经济问题提供有价值的见解。
The smell of freshly baked bread is the universal language of comfort.
Invention is not enough. Tesla invented the electric power we use, but he struggled to get it out to people. You have to combine both things: invention and innovation focus, plus the company that can commercialize things and get them to people.
It is only very ugly or very beautiful women who ever hide their faces.