Lee Smolin

The smaller the planets are, they are, other things being equal, of so much the greater density; for so the powers of gravity on their several surfaces come nearer to equality. They are likewise, other things being equal, of the greater density, as they are nearer to the sun.

I don't think of people as black or white. It's a question of are they photogenic or not? I don't think anyone says, 'Let's book her. She's black.' I think they say, 'Let's book her. She's good.' We've come that far.