Part one of a four part series on the fundamental forces (or interactions) of physics begins with the strong force or strong ...

For decades, physicists have relied on the principle of symmetry to simplify and understand the complex behaviors of subatomic particles. Symmetry in physics basically means that some rules of nature ...

Scientists have released the most detailed analysis yet of how protons and neutrons acquire their mass, solving a decades-long puzzle that the Nobel Prize-winning Higgs mechanism could not explain.