"But Dad! You can't have a square root of a negative number!"
"Yes you can" I reply "you just can't write it down."
"eh?"
"Its called an imaginary number"
"But if its imaginary how can you have it?"
We had been discussing some maths tests which he had done and one of the things on the paper was square roots. Now just for amusement (ok ok evil pleasure) I asked him what the square root of -1 was.
"Its called i" I told him "so whats i times i?"
"i squared .... " came the reply ....
Stargate mercifully distracted him at that point.
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