 The third and final set of open issues regards possible observations that would show that the SM is substantially wrong. Any scientific theory should be incompatible with at least some observations, and that is the case for the SM. In the early days of relativistic cosmology, the universe was judged to be younger than some stars or globular clusters. This conflict arose due to a mistaken value of the Hubble constant. There is currently no such age problem for the SM, but obviously discovering an object older than 13.7 Gyr would force a major re-evaluation of current cosmological models. Another example would be if there was not a dipole in matter number counts that agrees with the CMB dipole (Ellis &amp; Baldwin 1984).