The Portal Paradox

Thanks to CuriosityStream for supporting this video. Head to and use promo code minutephysics for 30 days FREE! This video is about the Portal Paradox - a paradox in the video game Portal (and Portal 2) regarding whether or not a companion cube passing through a moving portal plops out of the other end with no speed (velocity, momentum), or shoots out at high speed. It’s a question of conservation of momentum, relativity of velocities, wormholes, 3D printers and qua