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One of the great things I've found about the Google Community of Educators & Trainers & Innovators is how incredibly friendly and willing to share they are.
Updates, newsletters, podcasts, info graphics, tips, tricks, ready to use activities for your class in any topic with any application are all out there waiting to be found!
These are my current go-to favorites. What are yours?!
See my Symbaloo Webmix for Curated PD links and How to create your own network!