A physics moment

Good use of a word not heard often outside a physics classroom in a Slate article about Barack Obama's recent shifts toward the center:

More than a "clarification" but not quite a flip-flop, the centripetal shift is a proud tradition among presidential nominees (as is flat denial of any change in position).

I had to look up what centripetal was (1. proceeding or acting in a direction toward a center or axis, according to Merriam-Webster), since my high school physics apparently didn't take too well.

I like it when I have to go look up a word. I especially like it when I look it up and the word-nerd punch line  is something clever like this.