Listen to my interview with Karen Vaites (transcript): Sponsored by Pear Deck and Chill Expeditions   For as long as the internet has been around, teachers have been able to find free resources online. But while it’s great to not have to pay for things, free instructional materials don’t exactly come without problems. One major concern is quality. When a resource is free, it’s often hard to tell whether it was created by someone with a solid education background or…