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Why a Safety Net Should Catch Kids

Assume your government has $1 to spend on a social safety net. You need to decide who gets what. One way is ROI–the Return On your Investment. Of course we can ask about return through non-dolla…

The Choices That Elevators Make

Assume that you are on the seventh floor waiting for one of three elevators. Car 1 can arrive in 15 seconds but the total wait time will be 25 seconds because it has a stop on the eighth floor. Closer…