We've come a long way from the luminiferous aether. The speed of light, sometimes abbreviated as c, is a universal maximum posted speed that causality will enforce. It's the greatest speed at which ...

Units of speed are always a unit of length per unit of time. Different units of length and time may be chosen depending on the situation. This makes it easier to read the measurements. For example, ...

Imagine supercomputers that think with light instead of electricity. That s the breakthrough two European research teams have made, demonstrating how intense laser pulses through ultra-thin glass ...