Having covered the brain and the mind, we now take a second sharp turn and head in the other direction, in a manner roughly paralleling our previous discussion of biology. This time, however, we will be discussing culture.
We start the concept of a meme, analogous to the biological concept of a gene. The precise definition of a meme is rather controversial, but the definition suggested by Wikipedia will do well enough for us. In fact, on skimming that article, it makes almost all of the points I wanted to make here. Go read it.
The other topic I wanted to cover here is Lamarkian Inheritance. Although it is no longer supported in biological genetics, it is a useful concept to have since it is in some part the method of transmission of memes.