mcgrew writes "The Chicago Tribune is reporting that the TSA is now worried about surgically implanted bombs. Are they trying to get everyone to stop flying entirely? I know there's no way they'd get me in an airliner these days. I'll drive, even though it is far, far more dangerous."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"