I Decided That Now Is The Time

Civilization Originates In Conquest Abroad And Repression At Home.

One Person Making A Wrong Decision Affects The Whole Country.

We Can't Manipulate Some Stars While Maintaining Other Stars As Controls; We Can't Start And Stop Ice Ages, And We Can't Experiment With Designing And Evolving Dinosaurs.

Not Until The Beginning Of The 20th Century Did Europe's Urban Populations Finally Become Self-sustaining: Before Then, Constant Immigration Of Healthy Peasants From The Countryside Was Necessary To Make Up For The Constant Deaths Of City Dwellers From Crowd Diseases.

Livestock Adopted In Africa Were Eurasian Species That Came In From The North. Africa's Long Axis, Like That Of The Americas, Is North/south Rather Than East/west. Those Eurasian Domestic Mammals Spread Southward Very Slowly In Africa, Because They Had To Adapt To Different Climate Zones And Different Animal Diseases.