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Jim Simons’ mathematical skills helped transform him from a prize-winning academic at Harvard and MIT into a legendary financier whose algorithmic models made Renaissance Technologies one of the most successful hedge funds in history. After his death last year, one of his consequential bequests went to his daughter, Liz, who oversees the Heising-Simons Foundation and its nearly billion-dollar endowment.What Liz Simons has chosen to do with that inheritance might have surprised her father. Jim Simons devoted much of his charitable giving to basic research in mathematics and science, but his daughter’s foundation is moving in a very different direction. The Heising-Simons Foundation and similar organizations are supercharging a movement to remake K-12 mathematics education according to social justice principles.The revamp the advocates seek is profound. They reject well-established practices of math instruction while infusing lessons with racial and gender themes. The goal is to motivate disadvantaged students while dispensing with the traditional features of math, like numerical computation, that they struggle with on standardized tests – considered an oppressive feature of white supremacist culture.