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> it tricks half of freshmen at Caltech

They are freshman, i.e. untrained minds. Me, I probably would have failed that question at the time, too. Such a question wouldn't have been on a test, however, as test questions always involved a lot of math.

I remember one inglorious physics midterm exam that over half of the students flunked. The prof had some angry words for the class.

> In 8th grade?

Sure, if you'd laid the groundwork in class.



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