唯一的限制是你的思想。

The past is a foreign country; they do things differently there.

如果一个国家期望在国民无知的情况下却拥有自由，那么这种期望无论在历史上，还是未来都绝不会实现。如果我们打算抵御无知和捍卫自由，每位美国人都有责任了解一件公共事务的来龙去脉。

The mechanosensory system is nature's masterpiece of engineering.

Productive thinking is characterized by the sudden appearance of the solution as an insight.

I'm not a role model, but if it makes you sleep better at night, call me what you want.