Be a pro. Back up your back up. Have at least one physical backup and one backup in the cloud. Have more than one of each. How much would you pay to retrieve all your data， photos， notes， if you lost them？ Backups are cheap compared to regrets.

我使用的材料是时间的见证。

When you lead， your real job is to create more leaders， not more followers.

Friends are better than money. Almost anything money can do， friends can do better. In so many ways a friend with a boat is better than owning a boat.

Quantum cryptography doesn't rely on the difficulty of mathematical problems, but on the fundamental laws of physics.