Very clever/funny/apt sayings on buttons. I likes this one: The unfacts, did we have them, are too imprecisely few to warrant our certitude. Fits our political climate of lying denial, don't you think?
Fascinating implications for teaching here. Is this an example of extreme teaching, teaching them how to learn instead of what to learn. Remember: the bibliography may be more valuable than the book. And that's not a bad thing.