I went to the university of Durham in the U.K. - I paid my tuition, rent, and living expenses every year by just collecting the stacks of discarded textbooks, a

I went to the university of Durham in the U.K. - I paid my tuition, rent, and living expenses every year by just collecting the stacks of discarded textbooks, and selling them on at a 30% discount from the university bookshop’s prices to the next year’s undergrads. My only cost was paying (cheap) rent on a house under a railway bridge that I turned into an amazing fire hazard over the summer. Best (in terms of mass to value) dumpster dive find I had was a box of laser rubies.