Bill Gates has shared the staggering amount his charitable foundation has spent so far in its mission to fight preventable diseases and reduce poverty. "I've given over $100 billion," he told the BBC, "but I still have more to give." The Microsoft co-founder, along with fellow billionaire philanthropist Warren Buffett, is channeling their wealth through the Gates Foundation, which he initially established with his ex-wife, Melinda.

Gates credited his mother for instilling the value of philanthropy in him from a young age, often reminding him that "with wealth comes the responsibility to give it away."

Disclaimer: This video is taken from BBC News.