High-speed imaging reveals that the squeak of soft–rigid frictional interfaces, like sneakers sliding on a basketball court, arises from intersonic opening slip pulses—analogous to earthquake ruptures—that thin ridges on the rubber confine to repeat at a musical frequency.
Some police officers we spoke to have since acknowledged failures in intelligence, planning and command. Several said they had been unprepared for a crowd rapidly mobilised on Discord. Others questioned why military support did not arrive sooner.
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