Fascinating read the 72 rule…
Sadly thanks to my dismal math performances all through school I was unable to pursue those areas such as medicine or chemistry, construction , etc, were kept well out of my reach.
Over the years however I,ve picked up a couple ,tricks, to reach answers faster than others much to my delight. I thought maybe reading your ,72, I might pick up yet another trick even though this late in the game. Haha not gonna happen, just too beyond me.
Doesn’t take away that it,s a fun read.
Thanks
Tom