The world's second-richest man, Warren Buffett, has given its richest, Bill Gates, the largest charitable gift in history - an estimated $37bn (20billion).
Who else has been generous with their cash? Test yourself with our philanthropy quiz.
http://news.bbc.co.uk/1/hi/magazine/5125180.stm
I only scored a measly 4 out of 10

You're too old to lose it, too young to choose it
And the clock waits so patiently on your song
You walk past a cafe but you don't eat when you've lived too long
Oh, no, no, no, you're a rock 'n' roll suicide