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+As you probably guessed, these are not fireworks for the 4th of
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+2
+00:00:02,600 --> 00:00:06,670
+July but, rather, the explosion of the Ariane 5, which happened 30 seconds
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+3
+00:00:06,670 --> 00:00:09,250
+or so after takeoff due to a software error. And this is
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+4
+00:00:09,250 --> 00:00:12,020
+just an example of what can go wrong when we don't build software
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+5
+00:00:12,020 --> 00:00:15,600
+and we don't test and verify and perform quality assurance of software
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+6
+00:00:15,600 --> 00:00:18,540
+in the right way, and quite an expensive one. In fact, to develop
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+7
+00:00:18,540 --> 00:00:21,250
+and to build the Ariane 5 it took 10 years. The cost
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+8
+00:00:21,250 --> 00:00:25,240
+was around $7 billion and there were $500 million of cargo on board.
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+9
+00:00:25,240 --> 00:00:27,280
+Luckily, at least there were no humans on the
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+10
+00:00:27,280 --> 00:00:29,400
+rocket. And you can find more details in case
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+11
+00:00:29,400 --> 00:00:31,610
+you're interested about the Ariane 5 accident in the
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+12
+00:00:31,610 --> 00:00:33,230
+lesson notes. I put a couple of links there.
+