The history of a nation is, in essence, the history of its ruling class.

The Tesla Roadster… it’s a two-seater sports car， very high performance…In fact， it’s beat any Ferrari or Aston Martin in acceleration.And it has more than twice the energy efficiency of a Prius.

The key to successful investing is to have a long-term perspective, a disciplined approach, and a clear understanding of the market.

The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

宝贝，这些我都经历过来了，我是个勇敢的母亲。

The beauty of computational complexity lies in its ability to classify problems based on their inherent difficulty.

学习数学的唯一方法就是做数学。

民主城邦的基础是自由权。