To continue on with Bingo's line of thinking and Lanny's anaolgy......
It's like NASA having issues with Astronats coughing and then falling over dead in space. So they pass a rule saying none of them are allowed be smokers before going into space. But it turns out the problem was with the seals on the spacecraft.
Or, another NASA thing. For decades they've been working on ways to make the heat resistant tiles stick to the hull better. Then one day when Columbia explodes, they take a closer look and notice that the problem all along has been chunks of foam falling off the spacecraft on liftoff.
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