Scientists are not immune to the seductive and distant charms of the domestic cat. Of course, Erwin Schrödinger could be accused of animal cruelty for his famous mental experiment, but Edwin Hubble had a cat named Copernicus, who stretched out on the papers on the astronomer's desk while he worked, purring happily. A Siamese cat named Chester was included as co-author (F.D.C. Willard) with physicist Jack H. Hetherington in a low temperature physics article in 1975, published in Physical Review Letters. So, perhaps it is not surprising that there is a long and rich history, covering some 300 years, of scientists who reflect on the mystery of how a falling cat always lands on its feet, a phenomenon known as "cat spin."