The woes of the unit circle — a rant by my 15 year old daughterpic.twitter.com/y7UhTxiVp5
This is a sound notion, but it is costly and hard to do. Absent any reason to believe that all the effort and expense might eventually lead to something widely and successfully used, no one bothers to make the attempt. Those who know don't speak, and those who speak don't know.
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Its worse than that. There have been efforts that have demonstrated results. See also the work of Roland Fryer. But the political process of selecting educational practices is not driven by what works. Hence the system we have.
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It's worse than that. Our teacher corps lacks the subject matter understanding prerequisite to the successful execution of even the most mathematically sound and politically popular of reforms. And making better teachers takes (much) more time and money than we have.
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