Mechanical engineering. Whenever I see a big piece of tech — say car, plane or any industrial machinery/piping — I think of all the time and effort that went into creating each part of it, from drawing blueprints, modeling, checking national/international standards, choosing materials, running software for calculations, running through different people for approval, assembly, maintenance, etc.

It’s so much work and even more paperwork. I feel we take what we have for granted.