Forbes' rich list: U.S. still has most billionaires

(CBS) Bill Gates: 'may be second, NOT First, is Forbes' list of the world's richest people Because they give so much away, But Giving back apparently hasn't put much of a dent in the earnings of the richest Americans.
The United States has the most most billionaires on the list, with 413

Pictures: Billionaires Giving Back

Carlos Slim was again at the top of the list. That's not a surprise. They was at the top last year. The Mexican business tycoon is worth $ 74 Billion.

Gates takes the second spot. Forbes lists his net worth at $ 56 Billion.