Mechanical aptitude!

My dad worked for Fairbanks Morse, and during the summer he would take me there on days they were pouring the engine blocks in the foundry, (yeah I know couldn't happen today). They would pour then break the molds of huge 12 cylinder diesel engines. Those huge Pielsticks ran our Navy for years. It was one of the most awesome things to see, molten metal turned into this huge engine after a few hours.