Interesting fact: "An American man who is seven feet tall is such a rarity that the CDC does not even list a height percentile at that stature. But the NBA measurements combined with the curve formed by the CDC's data suggest that of American men ages twenty to forty who stand seven feet tall, a startling 17 percent of them are in the NBA right now. Find six honest seven-footers, and one will be in the NBA." (_The Sports Gene_, pp. 131-132.)