Considered one of the most successful investors of all time, what "Oracle of Omaha" helped launched the Giving Pledge, which enlists billionaires to donate to charitable causes?

Warren Buffett and Bill Gates came together to launch the Giving Pledge, which asks billionaires to donate half of their fortune to charitable organizations. So far, the successful investor has given away over $45 billion but has promised to donate at least 99 percent of his wealth.

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