  We review the classical observational results for isotopic abundance
variations for several elements in CP stars. We concentrate on the "newest"
anomaly, in calcium. The cosmically very rare isotope, Ca-48 can rival and even
dominate the more common, alpha nuclide, Ca-40. Relevant examples are found in
the hot, non-magnetic HgMn stars, and the field horizontal-branch star, Feige
86. The calcium anomaly is also present in cool, magnetic stars, including the
notorious HD 101065, Przybylski's star.

Astrophysics