"We are all in the gutter, but some of us are looking at the stars."

The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

The power of abstraction is that it allows us to reason about systems at a higher level, without getting bogged down in the details.

复利回报的奇迹被复利成本的暴政所淹没。