We report the results of the U.S. Department of Energy "Grand Challenge" project on the ab initio calculations of hadron structure (proton, neutron, and other strongly interacting particles) and interaction in the framework of lattice gauge quantum chromodynamics. The electric and magnetic form factors which are deduced from the elastic scattering of electrons off the proton and neutron targets are simulated on a quenched 163 x 24 lattice. The masses of the exotic four-quark mesoniums, the molecules of the strongly interacting mesons, are calcu lated on a 24 x 12 × 12 x 24 lattice. Stable and meta stable configurations are found in certain quantum states. This finding agrees with the observed experi mental trend.
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