Harvard sentence
n.— «Verizon uses Harvard sentences—phonetically-balanced sentences developed by electrical engineers—to test signal quality. These special sentences use specific phonemes at the same rate they appear in English.» —“A drive around town asking, ‘Can you hear me now?’” by Kate Carroll in Princeton University Daily Princetonian (N.J.) Mar. 17, 2006. (source: Double-Tongued Dictionary)
Further reading
Charlotte from Princeton, Kentucky, wonders: What’s the difference between a spider web and a cobweb? There’s a bit of semantic differentiation between the two: A cobweb is usually an old spider web, while a spider web that’s not...
Astronauts returning from space say they experience what’s called the overview effect, a new understanding of the fragility of our planet and our need to reflect on what humans all share as a species. A book about the end of the universe...