So here’s a fun thing to ask at parties: which weighs more, a brand-new iPad or one full of photos, apps, and music?

Sounds like a trick question, right? Except it’s not; an iPad (or any device with solid state memory) with stuff on it weighs fractionally1 more than one without. Here’s why.

  1. And I mean “fractionally”; even scientists don’t have scales sensitive enough to measure it. []