Evolution and Goodness

Radiolab podcast: An Equation for Good.

Books = data.

``Quantitative analysis of culture using millions of digitized books'' by Michel et al., Science, 2011.
More here: http://www.culturomics.org/
Data and play here: Google Books ngram viewer

Social contagion, a review

The New York Times looks back at the work of Christakis and Fowler on social contagion.

A spreadworthy message

An excellent viral video from a recent political campaign.

Corporate contagion

The social network component of the spreading of spreading.
(The main article is here.)

The diffusion of retail establishments

The spreading of certain buildings
across the United States.