Professor Alexander explained to me, the idea of addiction we've all got in our heads, that story, comes partly from a series of experiments that were done earlier in the 20th century.
pengetahuan kita tentang kecanduan, cerita itu, sebagian berasal dari serangkaian percobaan yang dilakukan di abad ke-20. Percobaan yang amat sederhana. Anda bisa melakukannya nanti malam di rumah jika Anda agak sadis.