Wow. That is definitely not good news for the textbook publishers.
That is one of those things that really distinguishes a top grade teacher from the ones who are just marking time. I wonder what kind of review and approval process they've set up? The example given - Math classes - are pretty standard. Calculus isn't really open to teacher bias.
But .... history, literature, biology (the eternal evolution debate), government/sociology - those have some real minefields to tip toe through.
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