"Physicists And Light Bulb" joke

How many physicists does it take to change a light bulb?
Eleven. One to do it and ten to co-author the paper.
How many astronomers does it take to change a light bulb?
None, astronomers prefer the dark.
How many radio astronomers does it take to change a light bulb?
None. They are not interested in that short wave stuff.
How many general relativists does it take to change a light bulb?
Two. One holds the bulb, while the other rotates the universe.

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