103: Number of failed attempts a driver in Wales tried to use voice verification to pay a toll
43: Number of species of monkeys and apes lacking the vocal membrane, aka voice box, likely required for speech
13: Speed in MPH below which, after 2019 legislation by the UK’s Department for Transport, electric cars must emit warning sounds
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¹Footnotes
Wales: [walesonline.co.uk](https://www.walesonline.co.uk/news/uk-news/driver-slams-tunnel-toll-after-24750305). Box: [newscientist.com](https://www.newscientist.com/article/2333278-losing-parts-of-our-voice-box-may-have-helped-humans-evolve-to-speak/). MPH: [autoexpress.co.uk](https://www.autoexpress.co.uk/opinion/358588/sound-will-become-key-battleground-electric-car-dominance).
Originally published in the August 22, 2022, edition of the This Week in Sound email newsletter. Get it in your inbox via [tinyletter.com/disquiet](https://tinyletter.com/disquiet).