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.
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Currently the UK experiences about seven days a year where rainfall is more than 80mm a day – considered a heavy rainfall event. If 30mm of this falls in an hour it typically triggers a flash flooding warning.