Last year's top donation of $990m came from Zuckerberg, the 30-year old founder of Facebook.
This year's second largest gift year came from Ted Stanley, an 83-year old Connecticut billionaire, who pledged $650m to support research in mental health.
Stanley, who made his fortune selling sports memorabilia and other collectables, has a personal connection to the cause. He told The New York Times that his son, Jonathan, has a bipolar disorder and that medication saved his life.
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