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That is not the only change. Your grand-parents knew how to take care of
horses, how to plough, how to preserve certain foods, etc. Today our
agricultural products are extracted by less than 5% of people. And many of
them know more about chemical than about natural fertelizers. It has been
my impression that the degree of self-sufficiency has been decreasing
gradually, for better or worst, everywhere. Look at electronics, is it
the same as it used to be? It is often dominated by interchangeable boards,
operational amplifiers and elements which are too small to see and too
complex to think about, except in functional terms. How many of us can
explain or build computers?
A pharmacist used to be able to prepare drugs from simple components, today
s/he is often a clerk.
Ludwik Kowalski