A ten-figure net worth confers the freedom to donate big bucks to your favorite causes, and for the second year running, in partnership with the Boca Raton, Fla.-based Philanthropic Research Institute, we have ranked the Americans who gave the most in the last calendar year. Money talks, so we looked beyond mere pledges and determined actual liquid assets grantees received in 2013. We limited our scope to living donors and tracked how much they've given over their lifetimes and the share of their current net worth that represents. "These people are seeking change while they are still alive," says P.R.I.-founder R.J. Shook.
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