Since Jim asks about e = mc^2 it would be reasonable to assume he will
read my first post on "mass" and then ask me "what is material" or "what
is matter."
I usually answer that question by saying matter is "bound energy" or by
saying it is "localized energy."
I suppose that will bring the question "what is energy." The only
response I have to that is... energy is what the universe is made of.
Michael D. Edmiston, Ph.D.
Professor of Physics and Chemistry
Bluffton University
Bluffton, OH 45817
(419)-358-3270
edmiston@bluffton.edu