F# has quote and unquote and splice for macro building - typed and untyped quote even - and Unquote [github.com] is a handy test lib that exploits this to write nice test failure messages for you when given normal code.
iOS automation sneaks into Switch Control: Work with recipes. A recipe lets you temporarily assign a special action to a switch. For example, you can choose a recipe to turn pages in iBooks or control a game. [help.apple.com]
Follow a road. Hold your finger down on the road, wait until you hear “pause to follow,” then move your finger along the road while listening to the guide tone. The pitch increases when you stray from the road. [help.apple.com] Wow. Bravo Maps! Wonder what GMaps does?
Three-finger triple-tap: Turn the screen curtain on or off. If both VoiceOver and Zoom are enabled, use the three-finger quadruple-tap gesture. [help.apple.com] Signs you've hit an expert UI: Multifinger quadruple tap gestures appear.
Eventually a system which communicates exclusively through non-blocking queues effectively becomes a set of communicating event loops, and its problems revert to those of an event-driven system. [glyph.twistedmatrix.com] Hi, GCD - more event loops than threads in many ways.
@clarkgoble Oh, also, with laptop, far easier to spawn a ton of tabs to compare views or find more info on a detail I want to learn more about. Whereas on phone I'm likely to bag the curiosity, plough on, and miss that learning experience.