“Every time they delayed a scheduled launch, they faced widespread public criticism and threats to funding. Each time they celebrated a flight that made it into orbit, they were encouraging their engineers to focus on the fact that the launch resulted in a success rather than on the faulty processes that could jeopardize future launches. That left NASA rewarding luck and repeating problematic practices, failing to rethink what qualified as an acceptable risk. It wasn’t for a lack of ability. After all, these were rocket scientists.”