The measured magnetic moment of the electron agrees with that predicted by the Standard Model to within four parts per billion.

ECONOMIST: Particle physics

According to the standard model these six particles (the flavoured neutrinos and the corresponding electron-like particles) together with another six, the quarks (which make up the protons and neutrons in atomic nuclei), are the irreducible units from which the rest of matter is composed.

ECONOMIST: Neutrinos