"Publishers, naturally, loathe used books and have developed strategies to depress the secondhand market. They bring out new, even more expensive editions of popular textbooks every three to four years, in a classic cycle of planned obsolescence."

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If you try to multitask in the classic sense of doing two things at once, what you end up doing is quasi-tasking. It's like being with children. You have to give it your full attention for however much time you have, and then you have to give something else your full attention.

— Joss Whedon