The production lines often halted when safety sensors were triggered. Musk decided they were too sensitive, tripping when there was no real problem. He tested some of them to see if something small like a piece of paper falling past the sensor could trigger a stoppage. This led to a crusade to weed out sensors in both Tesla cars and SpaceX rockets. “Unless a sensor is absolutely needed to start an engine or safely stop an engine before it explodes, it must be deleted,” he wrote in an email to SpaceX engineers. “Going forward, anyone who puts a sensor (or anything) on the engine that isn’t
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