Turns out that’s not an easy question to answer. Even as the number of private schools that get taxpayer funds via school vouchers or tax credit scholarships is on the rise, few states keep any kind of tabs on what these schools are actually teaching. We talk to Rebecca Klein, education reporter for the Huffington Post, about her recent series on three popular curricula. As Klein explains, kids on the receiving end of these widely-used lessons are being schooled in an extreme religious and ideological worldview. Oh—and don’t miss Jack’s trip in the time machine to learn how US public schools were made secular in the first place.