My father, a mechanical engineer, was a tireless advocate of the hypocycloid crankshaft mechanism. In the 90s, hybrid vehicles with a hypocycloid-based generator feeding the batteries that make the electric motors go was the application he was going for, especially since hypocycloids function best at constant RPM.

I say this with all sincerity, I love this sentence:

"My father, a mechanical engineer, was a tireless advocate of the hypocycloid crankshaft mechanism."

For some reason just reading that brought a smile to my face.