永远看看你还剩下什么。永远不要看你失去了什么。
挑战不仅在于收集数据,还在于以改善生活的方式理解数据。
群星不会因为像萤火虫而怯於出现。
"A good picture book is like a good joke - it needs perfect timing."
The value of an economic model lies in its ability to explain and predict.