While neutrinos may only interact weakly with matter via. Gravitational forces, if the negativity and positivity of the neutrino interact, then it is determined that neutrinos have mass. The experimentally established phenomenon of neutrino oscillation, which mixes neutrino flavour states with neutrino mass states (analogously to CKM mixing), requires neutrinos to have nonzero masses.
No one could make anythink smaller than an atom lol n00bz u will all gonna explode cause of your stupid pride and greed for smaller stuff lol weird. U will all explode an if u try to split or make the atom then ur gonna just all die divine smiting against your stupid vain hubris u suck green!