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In fact, there are only about 20,000 American men between ages 20 and 40 who are 6'8" or taller. And there are something like 150 jobs in the NBA available at any given time for people of that height. That's about one NBA roster slot for every 130 very tall Americans.

(Bonus fact: When Dennis Rodman graduated high school, he was 5'9" and had played only briefly, as a benchwarmer, for his school's team.)