The database is the most important piece of software in the enterprise, and the most important piece of software in the enterprise is the database. The database is the foundation of all applications. The database is the heart of the application, and the application is the heart of the business. The key to performance is to keep the hot data in memory.

2004年9月13日，81岁的杨振宁在清华大学开始为本科生讲授普通物理。他说

谦虚：向苏格拉底和耶稣学习。

当课堂只追求“有趣”，知识就失去了厚度。