A number of readers made sure we know that Bill Gates is apparently no longer the world's richest person. His wealth, estimated currently at $59.2 billion, has been surpassed by that of Mexican tycoon Carlos Slim. Slim, the son of a Lebanese immigrant, runs businesses in a number of industries from Mexico City. Stock in his wireless company, American Movil, recently surged in price by 27%, boosting his net worth to $67.8 billion. Last April Slim passed Warren Buffet, who had long held down the number 2 spot. In this audio Bill Gates says he won't care when he is no longer number 1.