How do bionic arms work?

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I just saw a video on r/MadeMeSmile of a 12 year old boy putting on a bionic arm for the first time and I’m just wondering how the hell do they work….

In: Technology

Here is the link to the video [https://www.reddit.com/r/MadeMeSmile/comments/bt0tho/12_year_old_boy_putting_on_a_bionic_arm_for_the/](https://www.reddit.com/r/MadeMeSmile/comments/bt0tho/12_year_old_boy_putting_on_a_bionic_arm_for_the/)