Way back in the dark ages of the 1970s when I was an undergrad at a major midwestern university, I blew several hundred dollars for a brand new TI calculator.

Way back in the dark ages of the 1970s when I was an undergrad at a major midwestern university, I blew several hundred dollars for a brand new TI calculator. Alas, it’s use was limited to homework and we were told we could use pencil and paper or we could buy a slide rule. As some here have noted, slide rules helped develop one’s sense of magnitude and estimation. BTW, my old 50 year TI calculator still works.