Nice tale from Aesop. He was early but shouldn't

来源: 于 2023-06-11 17:00:52 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

take the credit for the sentiment as reciprocity must have traced back to human origins.

I imagine those who did not play quid-pro-quo quickly exited the gene pool.