Two fun things in one post. First is this video, which describes a robot arm tool you can build, control and trail. Looks like a great learning activity. I learned of it via an email sent to the Learning Engineering mailing list about a tool called TubeDummies, which takes a video, like this robot arm demonstration, and breaks it down into step-by-step instructions. While I wouldn't use it for everything, I can see how it would be useful for video-based instructions I'm actually trying to follow.
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