I have worked all types of jobs in many industries.
The most interesting job I have held was Junior Radiation Protection Technician in nuclear power plants. It was nearly wizardly, spending all day searching out invisible energy with seemingly ancient tools. (Some of the detectors are quite weather-beaten and still in use from the 70s.) I learned how long hours week after week makes even the kindest gentleman into a cranky lion, ready to bite your head off.
Changing plant conditions during outage meant that I had to pay attention during even mundane tasks. I never knew when a random pipe would be nearly glowing, or which wrench I was clearing from the contaminated areas would set off alarms on the fancy machines ten feet behind my station.
Unfortunately, nuclear stories are incredibly boring to the uninitiated. I’ll move on and just say; if you find radiation interesting, ask me the questions. I know most of the theory and some reality, and I like to talk about it.
The pay was great, the traveling was hard, and the hours were terrible. At the end of a contract, I came home exhausted to find that the world back home had forgotten me. Friends had new hangouts, girlfriends got lonely while I was away. It became pretty clear why all the old dudes I worked alongside had all been divorced three times. The work life balance is worse than terrible, abombinable. I learned to value that and got away from the industry just short of my Senior RadPro certifications.