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" ... If you begin with an electron neutrino (black) and allow it to travel through either empty space or ... [+] matter, it will have a certain probability of oscillating, something that can only happen if neutrinos have very small but non-zero masses. The solar and atmospheric neutrino experiment results are consistent with one another, indicating a massive nature for neutrinos. ... "
" ... When an electron binds to a proton, it forms a neutral hydrogen atom, with the entire system having a slightly smaller amount of rest mass than the free proton and free electron combined. If you put a neutral hydrogen atom on one side of a scale and a free electron and free proton on the other size, you’d find the neutral atom was lighter by about 2.4 × 10-35 kg: a minuscule amount, but a very important one nonetheless. ... "