The astrophysicist Neil deGrasse Tyson has never liked this view. “I hardly ever use the word intelligence,” says Mr. Tyson, who directs the Hayden Planetarium in New York. “I think of people as either wanting to learn, ambivalent about learning or rejecting learning.” He speaks from experience: As a young man, he was booted from one doctoral program but managed to get into another and complete his Ph.D.