I received (some would say earned) a BSME in 1977. Calculators were forbidden in my frosh year, 1973-74. Slide rules rule. To this day!
Slide rules were great as long as three or four significant figures were sufficient. Slide rules failed in analytical chemistry where calculations were often five or six significant figures.
When my son was in Junior High, I showed him how to use a slider rule. He spent one whole afternoon on the couch trying to get it to screw up. ;o)
BSME 1976
MSME 1979