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Researchers found a way to recreate fingerprints from the sounds made when you swipe a screen. (From a while ago, still interesting.) https://www.tomshardware.com/tech-industry/cyber-security/your-fingerprints-can-be-recreated-from-the-sounds-made-when-you-swipe-on-a-touchscreen-researchers-new-side-channel-attack-can-reproduce-partial-fingerprints-to-enable-attacks