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... A farting fly ...
that energy is insubstantial; that
there is no such thing as "pure energy". I wish they had not picked up
that particular concept. Caloric does not belong in a modern curriculum.
If you want to see energy done well, see Feynman Volume 1 on the
conservation of energy. He has a parable (Dennis and his blocks) which,
as usual, is conceptually right on the money.