I feel a lot safer with Siri in thumb press only mode (and with fingerprint unlock required at that)https://twitter.com/katecrawford/status/905745897069432833 …
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If you can hear 20kHz then you have pretty damn good hearing :-). I like to think I'm doing OK but I barely recognize loud 19kHz as a tone.
We recently did ultrasound tracking with mobile phones. All students in the room would freak out, I couldn't hear a thing. Me -> old. 
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