I've never used a Mac but my experience with iPhones and iPads (not mine) has convinced me to never touch anything Apple makes. The requirement of iTunes to send files between an iPhone and a PC is, for example, just ridiculous.
Nope, they actually appear and disappear. The idea is that even in vacuum there's a certain amount of background energy and that energy can randomly turn into matter-antimatter pairs in what is basically the inverse of matter-antimatter annihilation.