You may like to do crossword puzzles or word games to keep your brain active. I keep my tiny gray cells in tip-top shape by drawing plumbing riser diagrams as well as complex natural gas and ...

I keep my tiny gray cells in tip-top shape by drawing plumbing riser diagrams as well as complex natural gas and propane isometric drawings.

I keep my tiny gray cells in tip-top shape by drawing plumbing riser diagrams as well as complex natural gas and propane isometric drawings. I’ve been a master plumber for over four decades.