最成功的公司是那些为真实人群解决真实问题的公司。
The true value of a forest is measured not just in board feet of timber, but in the lives it sustains and the ecosystems it supports.
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
对付一个不自由的世界的唯一方法,就是变得如此绝对自由,以至于你的存在本身就是一种反叛。