With OS X Yosemite, Apple introduced a slew of new features that were aimed at "making the world's best operating system even better" (Apple's claim, not mine). While there were obviously new features, like Handoff which I find immensely useful, or MailDrop, which has turned out to be pretty much a life saver for me. Still, a lot of improvements in Yosemite were around minor things; stuff that you didn't even realize you needed before it was there. One such feature was the Dark Mode for Yosemite.
