Very interesting. Of course those college kids did not have tablet computers when they were in grade school. So why can't that method be used in grade school? I taught myself trigonometry with just my sisters high school book in 8th grade. The nuns would not use the algebra book we did have. Trig looked more interesting than algebra.
It's not so radical. We just don't hear about Vero Beach High School Florida, 1987. 10 years before Virginia Tech.
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