Scientists pushed photons across the universe to test the speed of light—and found Einstein’s cosmic speed limit still holds ...

The speed of light varies in materials, impacting fiber optics, laser systems, and semiconductor lithography through complex ...

The phase and the group velocity of light propagating in conventional optical media cannot exceed the speed of light in vacuum. However, in so-called epsilon-near-zero (ENZ) materials, light exhibits ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...