We all have a little box in our kitchen that heats food up in
minutes. But how the hell does it do that? Witchcraft? Not
quite. Actually, microwaves cause water molecules in your food
to move back and forth rapidly, and the resulting friction
causes it to heat up.  Sure, maybe you already knew that, but in
this video the engineering guy Bill Hammack explains that
concept in more detail using... cheese. So even if it's not
educational, it's delicious. [YouTube]