Societies depend on agreed rules.

Evolutionary game theory is a way of thinking about evolution at the phenotypic level when the fitnesses of particular phenotypes depend on their frequencies in the population.

Mathematics is so much easier than words mathematics makes things clear that words merely muddle and confuse and mess up.

Mathematics without natural history is sterile, but natural history without mathematics is muddled.

So far, we have been able to study only one evolving system and we cannot wait for interstellar flight to provide us with a second. If we want to discover generalizations about evolving systems, we will have to look at artificial ones.

Language changes very fast.

Scientific theories tell us what is possible; myths tell us what is desirable. Both are needed to guide proper action.