Q. Why is Stephen Hawking so good at air guitar?
A. Because he has excellent string theory.
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Explanation
This is a play on words. 'String theory' is a physics concept, but it sounds like 'string' which is what's on a guitar. Stephen Hawking was a famous theoretical physicist, so the answer ties his field of expertise with the action of playing the air guitar.
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Thumbs up from the scientists and engineers who got it.