Thanks for this fascinating series. I just heard the one on hulled wheats. One reason why they persisted may be their resilience under tough conditions. They germinate better in soaked soils (beside science, I learnt this from an alpine einkorn farmer in Turkey). Was not the Nile mud also soaked? They also persisted in Europe until well after the Middle Ages. Spelt remained the staple in the Alps until after 1900, for its winter hardiness. From Gerard’s Herball (1596) emmer is called “starch Corne” and widely used for paper making.