Warren Buffett, the world’s second richest man – who’s now worth $44 billion – will start giving away 85% of his wealth in July – most of it to the Bill & Melinda Gates Foundation. (CNN)

Warren Buffett, the world's second richest man – who's now worth $44 billion – will start giving away 85% of his wealth in July – most of it to the Bill & Melinda Gates Foundation. (CNN)

The Gates Foundation is focused on world health — eradicating diseases like malaria, HIV/AIDS, and tuberculosis — and on improving U.S. libraries and high schools.