• sramder@lemmy.world
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    4 months ago

    It’s been a few years, but they are white round pads, probably 3 inches wide. I’m not sure what’s on the pad, probably a solvent of some kind.

    The pads go in a machine about the size of an larger microwave oven which I believe uses NMR to scan for nitrates and other kinds of explosive residue.

    It was a pair of highschool level sumo robots, lots of wires and motors and gears.