Read a May 4, 2011, essay in Scientific American, “Does Revenge Serve an Evolutionary Purpose?” A psychologist who studies human behavior explains the complex desire for vengeance in the context of bin Laden’s death.

David Knowlton is a professor in the behavioral science department at Utah Valley University in Orem. His specialties include the anthropology of Mormonism.

U.S. Rep. Mike Simpson, a Republican, represents Idaho’s 2nd District and is a member of the LDS church.

U.S. Rep. Raul Labrador, a Republican, represents Idaho’s 1st District and is an LDS church member.

U.S. Rep. Jim Matheson, a Democrat, was re-elected in 2008 to his fifth term representing Utah’s 2nd District. He also belongs to the LDS church.

U.S. Sen. Tom Udall, a Democrat, was elected to represent New Mexico in the Senate in 2008 after serving five terms in the U.S. House. He also had served as the state’s attorney general.

U.S. Sen. Dean Heller, R-Nev., was appointed to the Senate in May 2011 to fill the vacancy left by Sen. John Ensign’s resignation. Heller previously represented Nevada’s 2nd District in the U.S. House, and before that, he served many years in state government.

Lisa Beavers, a licensed professional counselor in Nashville, is forming a safe haven program to meet youths’ concerns about gender or sexual identity formation.

Read a Sept. 23, 2009, New Orleans Times-Picayune story on Bartholomew’s visit to the United States and the Religion, Science and the Environment Symposium.