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… is from page 1 of my former colleague Thomas Hazlett’s 2017 book, The Political Spectrum: The Tumultuous Liberation of Wireless Technology, from Herbert Hoover to the Smartphone [2]; it’s the book’s opening sentence:
No natural resource is likely to be more critical to human progress in the twenty-first century than radio spectrum. Invisible, odorless, and ubiquitous, it is the space through which electronic communications travel.