donation chain
Quotes
[Erdős] once gave $1,000 to a talented high school student struggling to meet tuition for Harvard University. Ten years later that student felt ready to pay the money back, but Erdős instead insisted, “Do with the $1,000 what I did.”
Jack Murtagh, This Nomadic Eccentric Was the Most Prolific Mathematician in History, Scientific American, April 1, 2024, p. 5–6