One of the world's largest hedge funds is now letting computers trade completely on their own

The humans have all gone home. But the computers are just waking up. Man runs about $43 billion in assets through quantitative trading. Algorithms do most of the work, with people writing the code to build them and monitor for any anomalies after the fact. The machines are trading about 21.5 hours per day, from the open of the Asian markets to the close in the U.S. It's a strategy the firm has been utilizing for 30 years.