46 years ago today, veteran astronaut Gus Grissom, first American spacewalker Ed White, and rookie Roger Chaffee were killed in a cabin fire during an Apollo 1 launch pad test. The first majorly fatal accident in NASA's history, the fire was caused in part by the cabin's pure oxygen atmosphere and a number of other dangerous design flaws that were corrected over the 20 month delay that followed the incident.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/F-CNIWaqofk/remembering-apollo-1-nasas-first-major-disaster
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