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As you probably guessed, these are not fireworks for the 4th of

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July but, rather, the explosion of the Ariane 5, which happened 30 seconds

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or so after takeoff due to a software error. And this is

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just an example of what can go wrong when we don't build software

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and we don't test and verify and perform quality assurance of software

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in the right way, and quite an expensive one. In fact, to develop

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and to build the Ariane 5 it took 10 years. The cost

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was around $7 billion and there were $500 million of cargo on board.

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Luckily, at least there were no humans on the

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rocket. And you can find more details in case

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you're interested about the Ariane 5 accident in the

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lesson notes. I put a couple of links there.