Very accurate electronic structure calculations sometimes require that familiar simplifying assumptions be forsaken. In particular, the assumption that molecules have a geometry (equilibrium nuclear configuration) and the convenient picture of molecular orbitals for electronic states. A class of wave function that does not require fixed nuclei and allows non-orbital product description of states is called explicitly correlated. We have made significant advances to the application of such wave functions [see the references D.B. Kinghorn, IJQC (accepted), and Kinghorn and Poshusta].