Forbes' list of the most powerful people is out, and Bill Gates makes the list at number 5 for his philanthropic work getting vaccines to kids in poor countries. Originally focused on providing better contraception to women in developing nations, Bill and Melinda Gates switched their focus to vaccines as they came to understand the massive impact preventative treatment can have on human health. Forbes scribe Matthew Herper chronicles Gates' journey from the earliest days of his philanthropic work to his emergence as the one world's foremost, and wealthiest, vaccine supporters. Profile