The most important invention in your lifetime is…
Portable handheld calculator
In 1967, Texas Instruments invented the first handheld calculator that changed how people did math to balance a checkbook, to create a budget and even doing homework.
Nowadays, the portable personal device of the smartphone has a calculator built in but I prefer the separate device to use to handle my financial matters that are charged by a small and inexpensive AA battery.
During my career of primarily working in banks and credit unions, my employers gave me a calculator unit that is plugged in and weighted to handle the numerous math problems. The durability and reliability in business of the instrument saved errors on the teller front line, loans, collections and accounting to determine accurate figures to make sound and solid decisions based on reliable information.
Beyond finances, calculators are used in everyday life of needing a correct number in statistics for sports and business plus the art world.
Calculate it.
Leslie Elizabeth David.
The Magnificent Modern Mature Woman 
This made me feel that moment of frustration and clarity when you’re staring at a problem that just won’t add up.
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Yes, I know the feeling.
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