From TIME: Can sharing facts you learn in class be as fun as sharing the latest “Call Me Maybe” parody on YouTube? That’s what SchoolTube says. The free website claims to be “the nation’s largest teacher-moderated K-12 video-sharing website” — think of it as YouTube for the education set.  Teachers and students can upload videos that they produce, from a lesson on quadratic equations to “Call That Safety,” a “Call Me Maybe” parody about science lab safety. Since father and son Carl Arizpe, 53, and Andrew Arizpe, 27, established the St. Louis-based site in 2007, they report that its library has grown to about 400,000 videos and represents at least one user from 40,000 schools nationwide.