China is nearing completion of an advanced facility to measure neutrinos, the smallest subatomic particles known to physicists. Its underground central sphere will soon be sealed off and filled with ...

Physicists have found provocative evidence that a subatomic particle behaves in a way that cannot be explained by the prevailing model of how matter works on the smallest scale. If confirmed, the ...

The particles that are in an atom: protons, neutrons and electrons The particles that are in protons and neutrons: quarks The four fundamental forces: gravity, electromagnetism, the strong force and ...