Yup, the title pretty much sums it up!
Math Teachers at Play #14 is up at Math Mama Writes… and, as always, is full of great posts. One of my favorite is a chart illustrating how few quadratics have integer roots. It’s a little daunting (although I suppose you can increase the number by considering negatives).
Speaking of Carnivals, there will be a Carnival of Mathematics #56 next Friday up at Reasonable Deviations. The official Carnival submission page doesn’t seem to work anymore, but there are instructions at the link above to email or post a submission.