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> In the seven decades he was at M.I.T., Professor Forrester retained an engineer’s curiosity about how things work, and occasionally voiced dismay that his students were not always so inclined.

> He recalled in 2011 that he once asked students in an engineering class if they understood how the feedback mechanism in a toilet’s water tank maintained the water level.

> “I asked them, ‘How many of you have ever taken the lid off a toilet tank to see how it works?’” he recalled. “None of them had. How do you get to M.I.T. without having ever looked inside a toilet tank?”