Lectures often go over people's heads because the lecturer doesn't know that students are confused or what they're confused about. By giving students a discreet way to give feedback and ask questions, lectures become more engaging and focused.
I made this after I started teaching a class and noticed that whenever I asked "any questions?" and nobody responded, it didn't mean they didn't have any questions. They just needed a better way to ask. This is my attempt to help bridge that gap, and so far it's been working really well. Hopefully it helps other educators.
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Afterplay
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Bored or Confused