Comments by "Diana Pennepacker" (@dianapennepacker6854) on "Most People Don't Know How Bikes Work" video.

  1. I laughed and I get the joke, but even if you understand rocket science you still have to build the tools that build the tools who build the tools. Speaking of that does anyone know a good video on who creates industrial tools? My uncle use to fix manufacturing lines that broke down. Like who makes, design this assembly line and the parts! I was watching an Elon Musk video where he showed off this crazy ass mold for the truck.
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