It’s in the article.....
“His first year included teaching Ptolemy’s “Almagest,” a treatise on planetary movements, and atomic theory. He since has taught 15 of the school’s 16 courses, the exception being sophomore music.”
Strange.
Difficult to imagine a college that has only sixteen courses; I wonder if that means sixteen SCIENCE courses, or if the writer got it plain wrong.
Oh, well - whatever.