History followed different courses for different peoples because of differences among peoples' environments, not because of biological differences among peoples themselves

Biology is the science. Evolution is the concept that makes biology unique.

Australia is the most isolated continent.

All human societies go through fads in which they temporarily either adopt practices of little use or else abandon practices of considerable use.

All recognized famous inventors had capable predecessors and successors and made their improvements at a time when society was capable of using their product.

Forced to choose between limiting population or trying to increase food production, we chose the latter and ended up with starvation, warfare, and tyranny.

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.