Back in school we used to have a book with an illustration of the solar system with all the planets in neat almost circular orbits in a plane around the sun. And there was Pluto with its skewed orbit that was all over the place. My teacher couldn’t convince me that it should be lumped in with the rest of the planets.

I felt satisfaction when Jim Carrey’s kids in Me, Myself and Irene complained that it shouldn’t be a planet. That was the first time I ever heard a person say that.