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OMG is this why the Tesla Cybertruck windows broke? - YouTube
November 25, 2019 at 6:25:24 AM PST - permalink -Very interesting...Window broke because the window rolled down a little after the sledgehammer demo. Since the glass was not fully secured, it flexed when hit by the steel ball more than it could tolerate and broke. The glass is prevented from flexing that much when fully rolled up into the door frame.
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- https://www.youtube.com/watch?v=PnPcMAwcJJ0
