The second year I taught, a student mentioned her mom taking on extra (night) shifts at the hospital where she nursed. This middle-aged nurse was on the graveyard shift to finance my student's tuition. From then on, I insisted that every textbook in my course have a 'desk copy' students could use at the library (instead of buy) and got a small grant for our mid-semester field trip. I urged the department to stop referring students to unpaid internships, with some success.