300,000,000: The estimated number of participants in the recent Apple Hearing study to assess sound level measurements
99: The estimated percent of birds identified by sound, not eye, in dense tropical forests
7: The increase in helicopter traffic between 2018 and 2019 in the summer months in part of Long Island, leading to a “Stop the Chop” movement
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¹Footnotes
Apple: [myhealthyapple.com](https://www.myhealthyapple.com/apple-researchers-publish-paper-outlining-data-collection-methods-and-more-for-the-apple-hearing-study/). Tropical: [kqed.org](https://www.kqed.org/science/1978710/heres-what-we-gain-from-preserving-natures-sounds). Chop: [easthamptonstar.com](https://www.easthamptonstar.com/villages/2022317/they-want-to-stop-chop).
*Originally published in the March 21, 2022, edition of the This Week in Sound email newsletter. Get it in your inbox via [tinyletter.com/disquiet](https://tinyletter.com/disquiet).*