  It is shown here that if we assume that what is conserved in nature is not
simply mass-energy, but rather mass-energy plus the energy uncertainty of the
uncertainty principle, and if we also assume that position uncertainty is
reduced by the formation of relativistic horizons, then the resulting increase
of energy uncertainty is close to that needed for a new model for inertial mass
(MiHsC, quantised inertia) which has been shown to predict galaxy rotation
without dark matter and cosmic acceleration without dark energy. The same
principle can also be used to model the inverse square law of gravity, and
predicts the mass of the electron.
