The first true alphabet was an invention of the Greek world, revolutionizing writing, literacy, and shaping foundations of ...

In Monday's puzzle, 27-Across read [Greek letter X], which was either a gimme or a "Now, which one is that again..?" for most solvers. CHI it was, but it is tough to keep track sometimes.

The 15th letter of the Greek alphabet had been a fairly innocuous entity for 2,500 years. But in just two weeks, it became notorious. Omicron moved beyond classical philosophy texts, beyond the ...