I’m old and we were poor: my family got our first microwave oven about the same time as I started to learn calculus in 12th grade. Both changed everything in a

I’m old and we were poor: my family got our first microwave oven about the same time as I started to learn calculus in 12th grade. Both changed everything in an epistemologically qualitative manner. Life before calculus/microwave, and life after calculus/microwave. How did we warm up leftovers before the microwave? What did the world look like before I learned calculus?