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9/18/2020 3:30 pm MST: We are aware of an issue with interactive lessons which are resulting in some users being unable to access the videos. Some quick workarounds to try include 1. Try using a different browser to access the lessons. 2. Clear your browser's cache and reattempt to access the videos.
If either of the above options are unsuccessful, you can email firstname.lastname@example.org so we can notify you when the videos are accessible again.