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[i]More important than the difference in fatality rates Soyuz' fatalities occurred in the first 10% of the program — the 41 years and 103 nonlethal flights since then suggest that the most lethal bugs have been worked out. Fatal shuttle accidents were evenly spaced through the program. The Columbia Accident Investigation Board judged that the shuttle could not be made into a safe, operational vehicle, and that the right way to manage risk was to fly only essential missions. The key lesson is the difference between safety and survivability. Rockets are unsafe. They "explode" about 1% of the time. The key is to build a system that allows people to survive a catastrophic failure of the launcher. This usually requires putting people on top of the rocket, not to one side, and this has the added benefit of protecting your heatshield from debris. shuttle had incredible accomplishments but was an unusually lethal experimental space vehicle. The future's safer operational human space exploration vehicles will not look like the shuttle.[/i]
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