How many mathematicians does it take to change a light bulb?

The answer: N. Unlike nearly all other lightbulb jokes, this one is not even offensive to any group - even though "N" is usually considered a positive integer unless said otherwise (in maths and in Fortran).

My favorite bulb jokes involve sending someone to watch out for incoming electric current.

For more serious stuff, read how many legislators does it take to change a light bulb - a bill to ban selling incandescents. I wish Israeli lawmakers could be smart enough for that, too.

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