The Campanile (also known as the Sather Tower) in Berkeley has a clock on each of its four vertical faces. The clocks usually do not match, and they didn't today, when I was almost late for an appointment. I'd forgotten my watch at home, and, after glancing at the tower, asked a random passerby, "Is it two or two-fifteen right now
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if A or B is true, but A xor B is false, then A and B must both be true.
in other words, if "it is 2:00 xor 2:15" is not correct, then either it is both 2:00 and 2:15, or it is neither of those.
however, if "it is 2:00 or 2:15" is correct, then at least one of those is true; therefore, both of them are true.
so the real question is, have you discovered the secret to time travel?
as a followup: how many engineers does it take to turn the Campanile 90 degrees counter-clockwise?
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Let me guess--it takes zero engineers, but one cartographer to mislabel every map of the campus?
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