Arboretum Cohousing is a 40-unit development in Madison, Wis. It includes affordable housing through Habitat for Humanity of Dane County.

The Richard Dawkins Foundation for Reason and Science supports “the scientific education, critical thinking and evidence-based understanding of the natural world in the quest to overcome religious fundamentalism, superstition, intolerance and human suffering.” The U.S. branch has headquarters in Washington, D.C., and is led by executive director R. Elisabeth Cornwell.

Project Reason is a nonprofit foundation dedicated to promoting secular values and scientific knowledge. Sam Harris is co-founder and chairman. Contact through the website.

The Tuscaloosa Cooperative Association, in Tuscaloosa, Ala., is a new group exploring environmentally sustainable cohousing for the area. Charles Nuckolls, a professor of anthropology at the University of Alabama, says the group would like to create an American village.

Orange Twin Conservation Community is a developing eco-village that grows from a record label in Athens, Ga.

Giles Blunden is a Carrboro, N.C., architect who does green building and cohousing. He designed the 46-home Pacifica Cohousing, incorporating environmental and community values, also in Carrboro.

The Institute for Science and Human Values is committed to scientific inquiry and the enhancement of human values and seeks to combine reason and compassion to achieve ethical wisdom. Toni Van Pelt is director of public policy.

Nubanusit Neighborhood & Farm in Peterborough, N.H., is a 29-unit cohousing community based on environmental values that includes an organic farm.

FreeThoughtAction aims to spread the message of rational thought through billboards and other means and thereby grow the ranks of the freethought community.