Ryan Hayward's self-folding crane begins as a flat, trilayer sheet. The middle pNIPAM hydrogel layer swells as the water around it is heated, and the folding is guided by slits patterned into the more ...
LEGO’s Power Functions elements mostly consist of DC motors and the hardware to be driven by those motors like gears and wheels. They also include battery packs, usually a bunch of AA cells in a ...
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