真理的概念在任何足够强大以包含算术的形式系统中都是不可定义的。
The notion of truth is not definable in any formal system that is strong enough to include arithmetic.
There are two ways to extend a business. Take inventory of what you are good at and extend out from your skills. Or determine what your customers need and work backwards, even if it requires learning new skills.
We are all made of star-stuff, and through physics, we seek to understand our origins.
未来属于那些能够自信地拥抱不确定性的人。