i. The origins and spread of agriculture; refuting dominant orthodoxies on the role of migration in agricultural spread.
ii. Dispersal of Modern humans - Homo sapiens; out of Africa, the expansion that resulted in Homo sapiens colonising Australia by 40,000 years ago, Europe by 40,000 years ago (where they displaced Neanderthals), and the Americas by 15,000 years ago.
iii Why Neanderthals proved less successful in the face of major climatic change while Homo sapiens prospered and spread through the world at a time of massive climate change.