judgecorp writes: "Microsoft's Windows Azure cloud service was down much of yesterday, and the cause was a leap year bug as the service failed to handle the 29th day of February. Faults propagated making this a severe outage for many customers, including the UK Government's recently launched G-cloud service."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"