For nearly an hour, no one speaks a word of English in this first-grade math class. Not the teacher, Ying Ying Wu, who talks energetically in Mandarin’s songlike tones. Not the students — 6- and ...
Back in 2019, Po-Shen Loh—an associate professor at Carnegie Mellon University and national coach of the U.S. International Mathematics Olympiad—taught the world a new way of solving quadratic ...
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