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I am a member of the Discovery Education Network but I never thought of it as a repository because no one in my district uses it that way but now that I think of it as an OER resource I will be sure to speak up for OER with my district and the DEN peeps! The Spotlight on Strategy (SOS) is a wonderful place to get ideas too!

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Open2Study an option from across the pond. https://www.open2study.com/

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Very easy to find and move around. The Series helps you filter down the information by topic and series.

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Hands on activities to engage K-12 minds.

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Tons of historical photos and documents that are in the public domain. Great for history and finding primary sources: https://dp.la/

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Videos that can be used for many subject areas including English grammar!

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Complete, standards-aligned, open textbooks for K-12. Textbooks can be remixed, revised, and downloaded: https://www.ck12.org/student/

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https://openstax.org/ high quality college level texts with some AP based materials too.

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This is one of the places I send my students when they are looking for Primary Sources! Love this!

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The site takes what's great about a Ted Talk and turns it into a lesson.

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I liked this one because of the ability to really filter through your lesson activity options. If I'm a low-tech teacher, or just busy, this would be easy and efficient.

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There is a lot!  Trying to figure out how to filter it all down to find what I need.

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https://alison.com/

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Had no idea about this piece of Amazon. One featured contributor is BioBuilder—impressive at first glance. Co-developed by MIT and high school teachers.  Also Newseum—lessons and resources to support learning about first amendment.

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Looking for materials about insects for young learners, and my first choice was built in flash ... thus not viewable on iPads.

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Lots of good stuff, easy interface, love the curriculum correlations on some products. I did run into a fully copyrighted book, though, so would need to be careful in searching and using.

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Vetted resources and fun simulations that teachers can introduce to students and track progress

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Started here, filtered results by pub year and landed on a writing course put out by Cengage, a company which publidhes a ton of reference materials.

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I can spend days looking through the 3D content for my makerspace!

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Edpuzzle is a great resource to formatively teach and quiz that students can do in and out of the classroom. You can create your own video or choose from the multitude of other venues.  After you have chosen the video you can clip the video as you see fit and move on to inserting quiz questions of what the student is using. You can monitor how often the portion of the video was being viewed and which questions needed reteach opportunities.

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Easily create beautiful interactive video lessons for your students you can integrate right into your LMS. Track students' progress with hassle-free analytics as you flip your classroom!

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Lot's of primary sources

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Orange Grove did show me when a link was no longer working by telling me it was bad. 

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Orange Grove did show me when a link was no longer working by telling me it was bad. 

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Nice to see resources for elective courses

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I almost forgot about this site. I loved using it in the past! Great re-find for Primary Sources!