Tragedy struck when the Space Shuttle Challenger disintegrated just 73 seconds into flight. Hours earlier, engineers argued to cancel the launch, amid fears of such a tragedy – so why did it go ahead?
★ 8.5
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★ 7.4
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★ 6.1
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★ 6.7
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★ 5.3
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★ 7.8
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★ 5.5
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★ 5.2
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★ 7.5
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