and my son is an Aerosapce Engineer.
I don't have a joke - but a pretty revealing anecdote. During my sophomore year at MIT as an Aero & Astro student, I interviewed for a summer job in the Physics Department. The professor described his neck-and-neck race with the Dutch on proving you could make helium into a Superfluid - they'd already done it with hydrogen. After a long explanation of his experimental apparatus and the process, he asked me if I had any questions.
I said "Yeah...what can you DO with a Superfluid?"
He shouted "NOTHING!!", and rose halfway out of his chair while doing so.
"Uhhh...no more questions," I said. I got the job.