一想到美国的大学，大多数人首先想到哈佛麻省理工这些高大上的学校，
想到那些在这个公开课那个公开课口吐莲花的大牛，
但有谁知道，
美国大学的天空主要是由临时工撑起的？

看段文字：
Adjuncts, also known as contingent faculty, teach on a contract basis, often booked one semester at a time. It's hard to count them precisely, since the lines between different kinds of academic jobs aren't always clean, but contingent faculty—including part-timers, non-tenure track full-timers, and graduate assistants—number well over a million and now make up 75 percent of higher ed faculty. Part-timers alone are 762,000, or just over half, at last count.
出处：http://www.labornotes.org/2013/05/adjunct-faculty-now-majority-organize-citywide

75%？你的天！3/4的天空啊！
这些兼职教授年收入大概100个二百五美元，仅仅超过美国政府规定的四口之家贫困线。
对于这些人来说，读书不仅可能没有改变命运，反而被命运改变了。