it's run by manoj narang and a small group of mathematicians and scientists called "quants," which is for quantitative analysts. and their high speed computers trade 40 million shares every day. are humans ever involved in the trading? >> manoj narang: humans are not involved in the trading, because humans are way too slow to trade on the kinds of opportunities that we're trying to capture. we're trying to capture opportunities that exist for only fractions of a second. this stock over here was down 1.8% for the past week. >> kroft: the tradeworx computers don't care where a stock is going to be trading next year, next month, next week, or even tomorrow, because they are going to be in and out of it today in a matter of minutes. what's the point of buying and selling a stock that you hold for three minutes? >> narang: same objective that all other participants have in the market is to... to make money. you buy low, sell high-- that's how you make money. >> kroft: and the computer will know when to buy and when to sell? >> narang: sure, the computer is monitoring real-time data, and it