There is an "Open Letter on K-12 Mathematics" signed by some 750 people in the past two days, including various MathOverflow users (and two users with top-ten reputations). The letter focuses on math in public schools, especially in California, and the issues include:

- Should schools teach algebra before high school?
- Should schools emphasize or offer rigorous calculus vs less rigorous data science classes in high school?
- In what grade should students be split into different math classes,
vs one class for the whole grade?
- How can the curriculum help students from diverse backgrounds acquire useful mathematical skills?

For background on the California Mathematics Framework at issue, I found some stories in EdSource and CalMatters helpful. Meanwhile two of the letter-organizers argue their case in a recent guest post on Scott Aaronson's blog.

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