… 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; 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.


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.
