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Two Experiments Show Fourth Spatial Dimension Effect

To the best of our knowledge, we humans can only experience this world in three spatial dimensions (plus one time dimension): up and down, left and right, and forward and backward. But in two physics labs, scientists have found a way to represent a fourth spatial dimension.

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You Can’t Travel Back in Time, Scientists Say

Dashing the hopes of anyone who wants to be their own grandpa, some theorists now say this darling of science fiction just isn't possible.

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You Can't Travel Back in Time, Scientists Say

Dashing the hopes of anyone who wants to be their own grandpa, some theorists now say this darling of science fiction just isn't possible.