WatchKnowLearn has organized thousands of free K-12 educational video clips in all subjects for teachers, students, and parents. So far, grade K-6 videos have been aligned to Common Core State Standards. Grades 7 and 8 are under construction. Resources can be located with a keyword search or browsed by subject area. Clicking a subject to browse provides subcategories and subsequent subcategories. Resources can be filtered by age, although the age selection mechanism is unusual: ranging 1-18 to 18. Find out more HERE.