The World of Technology blog has rounded up a selection of engines  which powers airplane propellors (and moves like a hula-hooping robot), to the ingenious mechanism inside a sewing machine, which you still won’t work out even after staring at it for many minutes.

Complicated Mechanisms Explained in simple animations [World of Technology]

Gallery of GIFs Explains the Inner Workings of Machines | Gadget Lab | Wired.com.

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