  Nearly twenty years after the discovery of anomalous microwave emission (AME)
that contaminates to the cosmic microwave background (CMB) radiation, its
origin remains inconclusive. Observational results from numerous experiments
have revealed that AME is most consistent with spinning dust emission from
rapidly spinning ultrasmall interstellar grains. In this paper, I will first
review our improved model of spinning dust, which treats realistic dynamics of
wobbling non-spherical grains, impulsive interactions of grains with ions in
the ambient plasma, and some other important effects. I will then discuss
recent progress in quantifying the polarization of spinning dust emission from
polycyclic aromatic hydrocarbons. I will finish with a brief discussion on
remaining issues about the origins of AME.
