I am writing a new textbook on anomaly detection. It probably won’t be finished for at least a year, but here is an excerpt.
There is a widespread myth that NASA did not discover the hole in the ozone layer above the Antarctic because they had been throwing away anomalous data that would have revealed it. This is not true, but the real story is also instructive (Pukelsheim 1990; Christie 2001, 2004).
NASA had been collecting satellite data …