An artist's concept of multiple types of subatomic particles. Forget about turtles; for all practical purposes, it’s really particles all the way down. Consider the seemingly simple matter of their ...

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 ...

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 ...