Comment by dotancohen

  > have a decent vocabulary and a good feel
  > for the different ways to structure an idea

This sign of intelligence is also good for talking to people on their level: Explaining things to children and adults alike while meeting the expectations and comfort zone of both. I've always admired people who can articulate their ideas in a broad range of spoken formats for the intended audiences.

Interestingly, some of the best-known examples of people like this are all physicists: Einstein, and Hawking, and Feynman especially.