"When I was 14 I used to have a calendar on my wall, crossing the days off until I was 15, because the school leaving age was 15. Then three months before I turned 15 they changed the leaving age to 16."

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Faced with a time shortage, we squeeze tasks into the nooks and crannies of our calendar, leaving less and less time to switch between them. As a result, we become less and less productive exactly when we need to be most productive.

— Sendhil Mullainathan