Quantum cryptography doesn't rely on the difficulty of mathematical problems, but on the fundamental laws of physics.
To one who has faith, no explanation is necessary. To one without faith, no explanation is possible.
我们这个世纪的贫困与以往不同。它不像以前的贫困那样是自然稀缺的结果,而是富人强加给世界其他地区的一系列优先事项的结果。
文学和科学相比,的确没什么用处,但文学最大的用处,也许就是它没有用处。
每块石头都在讲述故事,我们的职责是让这个故事有意义。
The concept of legal obligation is central to the understanding of law.