The Portal Paradox

Go to to get access to Nebula, plus you'll get a 20% discount on an annual subscription. 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 quantum teleportation, glitches, and more. REFERENCES Conservation of momentum #Conservation_in_a_continuum Principle of Locality YouTube video of testing the Portal 2 game engine on the portal Paradox Tutorial for how to program the Portal portals on your own: Support MinutePhysics on