> They've never screwed me over, so I never felt the need to drop them.

You mean, you've never felt the need to drop them, so they've never screwed you over. =)

Within a certain degree of error, yes. But a quantity like current is really a time average.

The math is reliable because we stick (or assume) billions of electrons in close proximity and look at the emergent patterns on a larger scale.

You know what they say... Sufficiently advanced pedantry is indistinguishable from kindness.

Nope. Not with the new iPod touch at any rate.