I was reading the eBook by the James Randi Foundation, "Magic in the Classroom: Using Extraordinary Claims to Teach Critical Thinking." The book casually mentions a homeschooling group called "Homeschool Connections." While taking a momentary tangent to read up on that group, I find they have a free eBook of their own which would probably be useful to some of you. The book, sounding like a oft-repeated student mantra, is entitled, "Why Should I Learn This?"
Fair warning, the Homeschooling Connections group is a Catholic group. Skimming the eBook promises Catholic references will be made. However, if you happen to be Catholic, maybe it will work for you. And, if you aren't Catholic, you can probably rework the themes of the articles *in your own words* keeping the salient points.