Civilization is a stream with banks. The stream is sometimes filled with blood from people killing, stealing, shouting and doing the things historians usually record, while on the banks, unnoticed, people build homes, make love, raise children, sing songs, write poetry and even whittle statues. The story of civilization is the story of what happened on the banks.

Sustainability is no longer an option; it's a necessity for survival.

The beauty of mathematics only shows itself to more patient followers.

做一件事和做一件前无古人的事是两码事。

人们不想记住痛苦，他们想记住爱。但痛苦也是我们历史的一部分。

曾经尝试过，曾经失败过。没关系。再试一次。再失败一次。失败得更好。

The greatest value of drone technology is that it can reach places that are difficult for humans to access.