老年人相信一切，中年人怀疑一切，年轻人知道一切。
Science is the knowledge of consequences, and dependence of one fact upon another.
The quality of a country's institutions is the single most important determinant of its long-term economic performance.
Technology should serve humanity, not the other way around.
有时候最难的事情和正确的事情是同一件事。