How much do billionaires give?

In June, Warren Buffett and Bill and Melinda Gates challenged the nation's billionaires to give away at least half of their net worth. Here's how 9 big spenders dole out their money.

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Bill and Melinda Gates
Bill and Melinda Gates
This power couple have given $14.5 billion to fund vaccines.


NEXT: Mark Zuckerberg
Last updated December 14 2010: 8:44 PM ET
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