The speed of light is one of the most fundamental constants in physics, yet it has never been directly measured in one direction. Instead, scientists rely on assumptions built into how time and ...

Classical Mechanics:** Newton’s second law (F = ma) explains the relationship between force, mass, and acceleration. The law ...

A destructive windstorm disrupted the power supply to more than a dozen atomic clocks that keep official time in the United ...

These 26 breakthrough products and technologies—handpicked by our editors—are redefining AI, computing, and the connected ...