He would get so excited by the challenge of fitting the miles and miles of pipes efficiently into a small 3D space and it was of course long before the advent of computers so he had to figure it out in his head. I remember having an Atari 400 and trying to come up with a "solution" for him, having no idea what I was doing of course.

He once explained that by using lots of concrete and steel, the reactor was built to withstand a jumbo jet crashing into it and my young brain couldn't fathom why that might ever be a thing.

He was a phenomenal artist - the kind neighbors from afar would often come to for help with anything artistic - so his quick sketches of say, part of them steam pipe layout looked like they were done in Autocad 20-30 years early. I wish I still had some.

Good memories - thanks for suggesting..