Why can't we see

[Cr0m]

a parallel universe?

[Glennage]

Parallel Universes ain't even been proved. It was Hugh Everett III who came up with the Idea that they exist. But it's something we cannot prove, we can't see, sense, touch, take a temperature reading or anything like that to prove it's existence. I believe he came up with the idea to solve why quantum matter behaves like it does.

[Chronos]

Observations that require a parallel universe to explain are needed. No such observations are yet known to exist.

[Chalnoth]

Observations that require a parallel universe to explain are needed. No such observations are yet known to exist.
http://arxiv.org/abs/0809.4422