<p>There aren’t really very many physics majors, in my experience. We’re a small, odd bunch. Most people seem to be interested in business for some reason.</p>
<p>I think the joke was that (A) he’s from New York, and that is the state with the most applicants to Cornell (B) he’s a white male, and white males are quite common (C) physics is a semi-popular major, although I don’t think there too many of them.</p>
<p>I could be wrong, but that’s what I perceive the joke to mean.</p>