How many optometrists does it take to screw in a light bulb?

One? Or two? One? .... Or two?

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How many Heisenbergs does it take to screw in a lightbulb?

If you know the number, you don't know where the socket is.

How many scientists does it take to screw in a lightbulb?

Significantly more than zero, *p* < .001.