Bill Gates and Warren Buffett join us for the hour. Gates is the co-chair of the Bill and Melinda Gates Foundation. The philanthropy focuses on education, poverty, and global health. Buffett is chairman and Chief Executive Officer of Berkshire Hathaway. The company is one of the most successful companies of the last 5 decades. The two started the giving pledge in 2010. The initiative encourages the world's richest to donate the majority of their wealth to philanthropic causes. (Source: Bloomberg)