The example involving caged hens is unlikely to involve any kind of group selection for 'goodness'. See: Aarssen, L.W. (2008) Group-selection for ‘goodness’? An account of chickens, a comparison with plants, and implications for humans. Open Evolution 2: 41-43.
The pdf can be downloaded from:
posted by Lonnie Aarssen
December 22, 2008
JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.
The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.
View the full collection here.
An early peek at each new issue, with descriptions of feature articles, columns, and more. Every other issue contains links to everything in the latest issue's table of contents.News of book reviews published in American Scientist and around the web, as well as other noteworthy happenings in the world of science books.
To sign up for automatic emails of the American Scientist Update and Scientists' Nightstand issues, create an online profile, then sign up in the My AmSci area.