The Axiom of Choice (AC) was formulated about a century ago, and it was controversial for a few of decades after that; it might be considered the last great controversy of mathematics. It is now a basic assumption used in many parts of mathematics.
On November 20, 1985 […], the first retail release, Windows 1.01, was released in the United States at a cost of US$99 (equivalent to about $280.00 in 2023).