He wants to get rid of summer vacation:

One issue that doesn't come up enough in discussions of extending the school year is that doing so is also, fundamentally, an issue of economic fairness. If you believe in equality of opportunity, then one of the most important things the state can do is provide some baseline level of education that seeks to alleviate vast differences of class. But, small though it may seem, one of the most profound ways in which class differences express themselves is over the summer vacation.

The playbox-industrial-complex will never let it happen.

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