In 1972 I entered college and my goal was an electrical engineering degree. I still had a slide rule from high school and actually took a refresher course in my first quarter at college. By that winter, affordable handheld calculators were coming out and I bought the "Bowmar Brain" for $160 that Radio Shack was selling under there own name. It was heavy to hold with an LED readout and NiCad batteries and you had to charge it each night. It didn't even have scientific notation yet so you had to keep track of that separately! By the time the batteries died in ~1984, I replaced it with an LCD Casio scientific calculator for under $20.
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