There are two types of people . . .
Petra once told me how you can tell Harvard students from MIT students when you’re on the T.
“Harvard students are always talking about the great party they were at last night, while MIT students are trying to use vector addition to stay upright without having to hold on to anything.”
“That wouldn’t be that hard,” I said. “The train only moves in one direction, so you just have to position yourself so that you can apply an opposite force along that dimension.”
“See what I mean?”