Billionaire Paul Allen announced he is pledging the bulk of his fortune -- an estimated $13.5 billion -- to charity.
Billionaire Paul Allen has taken his friend Bill Gates up on his challenge to publicly pledge the majority of his wealth to philanthropy.
Allen, who is 57, said today that he plans to leave the majority of his $13 billion estate to philanthropy to continue the work of his foundation and to fund scientific research. It was also a way of marking the 20th anniversary of the Paul G. Allen Family Foundation, which he started in 1990 with his sister, Jo Lynn Allen, and has since given 3,000 grants totaling about $400 million. .
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