I discuss accurate theoretical predictions for masses of baryons containing the b quark. I point out an approximate effective supersymmetry between heavy quark baryons and mesons and provide predictions for the magnetic moments of Λc and Λb. Proper treatment of the color-magnetic hyperfine interaction in QCD is crucial for obtaining these results. Closely related methods are then applied to doubly-heavy hadrons: the recently observed exotic QQqq mesons and QQq baryons. Predictions are given for the masses and decay modes of additional QQqq mesons and of QQq baryons: Ξcc(ccq), Ξbb(bbq) and Ξbc(bcq), which might soon be seen experimentally, as indicated by the large number of Bc mesons observed by LHCb.