No, you can't. You can make a negative of the whole screen--which gives you black menus, along with messed up video, photos, graphics you're working on, icons, album art, games, Finder tags, wallpaper.... every aspect of color on the whole system. Now we can have a dark theme for the UI without messing up non-UI elements. Looking forward to it!
I'm ready for some "drone paranoia" about spying on people, "in the hands of terrorists," etc.... Even though consumer drones have very short ranges, can't deliver a payload as well as you could simply throw it, can only sneak up on people who have neither hearing nor vision, and are easier to control--and thus less dangerous--than the flammable fuel-filled RC aircraft people have enjoyed for ages.
I imagine they'll eventually ask for (and might receive) the source code, allowing the app to survive as a piece of history forever if the money is there to keep porting it. If not, they will have to display videos of it eventually.
Wow--I'm amazed at the reported results. Makes me want a more generalized sensor (of which I believe several have been proposed) to analyze more than just liquids; more than just foods, even. "What kind of wood is this?" "What kind of paint?" "What's the fat content in this dog treat?" "Is this vegan?" "Is this made from wheat?" As prices drops to $100 and below, personal molecular sensors (or whatever?) will be well worth it!
I don't want to track beverages, though. I...
Don't forget to contact Apple's business division even if you're a one-person operation: if you spend over $5k there's a discount to ask about. And I think it's $5k in one year, even if not on a single order--but I'm not certain. Anyway, a Mac Pro can easily cost over $5k. (And still cheaper than those GPUs alone!)
I think 20GB will be plenty for me for a year or three... by which time prices will drop further.
99 cents it is!
And of course you're getting more than just storage, with all of these options to one degree or another, you're getting services that go with it.
I also like that Apple has added APIs to make Dropbox and Google Drive better if they chose to use them.