2011 study from University of Pennsylvania and Stanford University on the potential consequences of early voting methods.
2009 paper by the Pew Internet and American Life Project on the rate of cell phone use while driving among American teenagers.
2009 National Bureau of Economic Research paper on the relationship between early exposure to violence and later problems such as substance abuse and delinquency.
2008 paper by the Widener University School of Law on approaches for realizing the potential benefits of energy efficiency in the United States.
2008 review by the Harvard Family Research Project of available research on the relative benefits and required factors for success of after-school programs.
2008 meta-study published in Energy Policy that examines more than 100 studies of greenhouse-gas emissions from nuclear power plants.
2010 report by the National Resource Council on the cost of the production and use of various forms of energy in the United States.
2007 meta-analysis by Amsterdam University of U.S. and international studies on transit stations' effect on property values.
2009 University of Texas metastudy on the cost, operational characteristics, and land-use impacts of different mass-transit technologies.
2009 study by Harvard's Belfer Center for Science and International Affairs on the cost of carbon sequestration and its long-term outlook.