https://mp.weixin.qq.com/s?__biz=MzkxNTMyMzU1NQ==&mid=2247484834&idx=1&sn=2c6b3e08eb50902eb91920621f611d3b&chksm=c161aa6ef61623787a43d9e6ee75023b889f7f375d22ec81e3af6c14a95ad281adb68d8fd167&scene=21#wechat_redirect
80:20% rule (top 20% did 80% of discovery)
Interesting USA and China PhD education comparison...