We first blogged about WatchKnowLearn in this post in May 2013. WatchKnowLearn is an indexed collection of over 50,000 educational videos for K-12 students. It's a great resource for teachers to find videos to include in classroom instruction (add them to a Blendspace!) or for students to use for independent (Genius Hour!) research. You can search by keyword and even filter by appropriate age. A login is not necessary but, if you create one, you can "favorite" videos for easy access later.
Interested in exploring other video learning sites? Check out these other options: