@geraniol - are these chemistry PhDs who chose high school teaching?
Your last sentence about postdocs triggers the memories about stories I read about how too many people are stuck in post doc positions waiting for that break in industry or assistant professor positions. I have to say this is not just for sciences. For a sample of n=1, the lab my daughter researched in at Standord had a postdoc with bioengineering from Harvard/MIT and worked for almost 4 years before getting an assistant professor position.