re: #209 palomino
Maybe the HS I attended was unusual, but all the science and math teachers had degrees in the subjects they taught.
re: #206 Kragar (Proud to be Kafir)
In my HS the chem teacher had a degree in chemistry, which is fortunate as he was pretty good and I took 2 years in HS. The physics teacher likewise was pretty good and he did have his physics degree.
As I wrote earlier, I suspect many HS teachers have degrees in the fields they teach. Well, except for sex-ed, which falls often on the shoulders of the PE teachers.