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MIT student Charles Guan created a running shopping cart mobile called as "LOLriokart". Powered by nickel-cadmium batteries, he invested $300 and took one year to build this one.

According to Guan’s math, given its weight and motor power, the cart could have gone 45 mph. That seemed a little risky, though, so he switched in a smaller motor sprocket, which cuts the rate at which the chain turns the rear axle. Using a go-kart throttle, he can vary between a gentle walking pace and 30 mph.

[via Popsci]