Agree with this. I had to make my own equipment everywhere I went. The people I met later in my career who went to nice schools, with illustrious research experience had no idea what they were doing. Okay that's an exaggeration. But, when they entered industry they trusted every black box and rationalized every bizarre thing they saw as if their results depended entirely on their domain of interest.

Negative concentrations no problem! That must mean the machine is tracking the previous known value and this is the difference! Oh my oh my... The things I've seen the highly/expensively educated get paid lots of money to do, present, and be rewarded for in regulated industries....