uNeutron decay: half-life 13 minutes
uNeutron Þ Proton + Electron + Antineutrino
nFew % weaker, few n, little He, few heavy elements; even these stay
trapped in stars.
nFew % stronger, many n, too much He, too many heavy elements; but these,
too, stay trapped in stars.
nThe weak force is tuned to a few percent.