Most-viewed video of 2017: Why don't perpetual motion machines ever work? #10YearsofTEDEd* Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? *We're counting down to our 10th birthday on March 12 by sharing ten of our most-viewed videos —one published in each year that we’ve been aroun

Perpetual motion engines are devices that can provide power forever without any external energy applied, but are they real? (Click 'Watch video' below caption for full vid!) #interesting #facts #physics #perpetualmotion #theory #energy | Filip Zieba