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A comment on A technique that enables people to hear ultrasonic sources above 20kHz.
https://www.eio.com/products/velleman-k8118-stereo-ultrasoni...
It actually turned out even cooler than I expected. A lot of things emit ultrasound that I didn't realise, like jingling keys, walking on dry grass, and all kinds of things in urban environments. And of course bats sound really neat also!
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https://www.eio.com/products/velleman-k8118-stereo-ultrasoni...
It actually turned out even cooler than I expected. A lot of things emit ultrasound that I didn't realise, like jingling keys, walking on dry grass, and all kinds of things in urban environments. And of course bats sound really neat also!