. >> facundo pieres: there's a lot of guys cloning.to be careful, you know, because, the thing is that they're opening too much, you know? i mean-- >> stahl: pandora's box. you know what that means?oblems- >> pieres: exactly. >> stahl: facundo pieres is number two in the world, right behind adolfo. he showed us what he can do, like dribble a three-inch ball in the air while galloping down the field 20 miles an hour. he's the captain of ellerstina, an old-school team made up of three brothers and a cousin. they are committed to keeping it a family enterprise. do you ever get angry at each other? >> pieres: yes. ( laughs ) yes, but in a good way. never, never-- never bad. >> stahl: his team is headquartered at another spinte, where they operate a multi-million dollar breeding business selling foals and embryos. they believe they can produce better horses through their the d.n.a. of two different horses, rather than by replicating just one. >> pieres: we want to keep it this way. and what we have here is amazing. >> stahl: in polo, what's