America’s richest man and history’s most generous philanthropist Bill Gates is using his wealth to improve lives, change outcomes and effect social change. The Bill & Melinda Gates Foundation has given away $30 billion since 2000. He recently announced the Foundation will “double down” on initiatives to promote major breakthroughs for people in poor countries. The Foundation is funding programs to develop affordable technologies to reduce child mortality, improve agricultural efficiency, spread the use of digital banking and revolutionize education through software. Those topics dominate his extremely active Twitter account – he has 20 million followers. One of his pet causes is recycled drinking water.