I've been in industry 40 years and can think of 2 times I directly used what I learned as part of my job. 1. Calculating the temperature distribution across a

I've been in industry 40 years and can think of 2 times I directly used what I learned as part of my job. 1. Calculating the temperature distribution across a fiber being heated by air (spoiler: it's uniform). 2. Calculating the annual rate of return from an investment from an Sybase SQL server without resorting to a procedural process, i.e. using only the ln, exp, and sum functions available. The second really goes back to high school math so doesn't count as a reason to go to college.