Ultrasonic Payments
I'm reminded of Google Tone[0], which beamed URLs audibly to nearby browsers in an Airdrop-style experience. A neat trick, but ultimately useless given that most devices have less obtrusive ways of sharing data P2P. The ultrasonic aspect of this experiment makes the technology a lot more useful.Tone also came with the unfortunate side effect of Google software having constant access to your microphone.0: https://chrome.google.com/webstore/detail/google-tone/nnckeh...