我们都是由星尘构成的，通过物理学，我们试图理解我们的起源。
We are all made of star-stuff, and through physics, we seek to understand our origins.
The world is so unpredictable. Things happen suddenly, unexpectedly. We want to feel we are in control of our own existence.
过去是一个异国；他们在那里做事的方式不同。
永远不要低估一个想法改变世界的力量。