I. Lavas and magmas. Geological history : 1000-1700 A.D.
Geological history : 1700-2000 A.D.
II. Flesh and genes. Biological history : 1000-1700 A.D.
Biological history : 1700-2000 A.D.
III. Memes and norms. Linguistic history : 1000-1700 A.D.
Linguistic history : 1700-2000 A.D.
Conclusion and speculations