One interesting gap in the standard model is why neutrinos have mass: https://cerncourier.com/a/the-neutrino-mass-puzzle/ https://cerncourier.com/a/the-neutrin

One interesting gap in the standard model is why neutrinos have mass: https://cerncourier.com/a/the-neutrino-mass-puzzle/ https://cerncourier.com/a/the-neutrino-mass-puzzle/