Yet it was desperately dangerous. The shuttle, at its launch, clung piggy-back on to 4m pounds of explosives. There was no escape route. Defective o-rings doomed the Challenger flight in 1986, and a missing chunk of insulating foam fatally weakened the wing of Columbia on re-entry, in 2002. The dreadful fan-like tumbling of the debris from the sky was all the worse because Columbia carried a woman teacher and a black astronaut among its crew, America in miniature.
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