The Einstein-Podolsky-Rosen Bridge is a tunnel connecting two universes. The idea was developed by physicists Albert Einstein and Nathan Rosen. They came up with the notion that if an object had strong enough gravity, it could literally rip space, creating a tear that would link parallel universes. The only known object in the universe with that kind of force is a black hole. Anyone who could enter the black hole would find an opening or wormhole that would take them to another universe. That wormhole is the Einstein-Podolsky-Rosen Bridge.

The problem with the Bridge is that the same force that warps space would tear apart anything that tried to enter the black hole. Until recently, it was believed that no one could do it. But in 1963, mathematician Roy Kerr came up with a way that someone could approach the black hole to enter the wormhole.

(Adapted from the Sliders Technical FAQ)

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