  I discuss a theory of non-solar cosmic rays (CRs) based on a single type of
CR source at all energies. All observed properties of CRs are predicted in
terms of very simple and completely `standard' physics. The source of CRs is
extremely `economical': it has only one parameter to be fitted to the enormous
ensemble of all of the data. All other inputs are `priors', that is theoretical
or observational items of information independent of the properties of the
source of CRs and chosen to lie in their pre-established ranges.
