Want to know just how deadly (or ineffective) your newly acquired tae kwon do kick is? Figure it out with the Tae Kwon Do Vest. This wearable project uses a bunch of piezoelectric sensors to measure the kick strength, translating that into a numerical figure for you to gloat over your opponents. I think it doesn’t really matter for the recipient as he/she will feel nothing but a world of pain instead.

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