Computer geniuses who've made it big are the ultimate heroes for many kids. These young millionaires in the high-tech and business worlds are big news today, but like all inventors before them, their work is based on the work of their predecessors.On August 9, 1995, Marc Andreessen's personal net worth skyrocketed from a few thousand dollars to over $58 million. As one of the founders of Netscape, Andreesson led a revolution that has changed the way...