Explain the overlapping dichotomies (Fat/Lean, Sweet/Sour) in the introductory essay (Fatty Sand). Add an entry in the glossary. see #173
@TillmannTaape @Pantagrueliste : I want to add a brief explanation of fat/lean, sweet/sour in the glossary, but I am unsure of the format (in parentheses? a separate sentence?) thanks for letting me know.