In a blockbuster show of billionaires believing in public health, Bill Gates and Mayor Bloomberg will spend $500 million on anti-smoking initiatives around the world. Five million people die from tobacco-related illnesses each year. Mayor Bloomberg, a former smoker who has helped implement a smoking ban in NYC's restaurants and bars in 2003. The $500 million number comes from the $125 million he gave to the Bloomberg Initiative to Reduce Tobacco Use in 2005, his......