The NRA and some concealed-carry activists say the best defense against gun violence is armed "good guys." Here, a man fires his pistol at an indoor range in Aurora, Colo., last summer. Alex Brandon/AP hide caption

itoggle caption Alex Brandon/AP

Chris Guthrie, vice president for operations at Canna Pi medical dispensary, inspects a medical marijuana product at his clinic in Seattle on Monday. Marijuana will be legal in Washington state from 12:01 a.m. Thursday. Anthony Bolante /Reuters /Landov hide caption

itoggle caption Anthony Bolante /Reuters /Landov

Online privacy advocates are hopeful the FBI investigation into retired Gen. David Petraeus' personal emails will put a human face on their efforts to update a stalled Internet privacy bill. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A damaged home rests on one side along the beach in the Belle Harbor section of Queens, N.Y., on Nov. 5 in the wake of Superstorm Sandy. Craig Ruttle/AP hide caption

itoggle caption Craig Ruttle/AP

John Disney (second from left) looks over the underwater probe used in his company's ocean fertilization project, at a news conference in Vancouver, British Columbia, in October. Andy Clark/Reuters/Landov hide caption

itoggle caption Andy Clark/Reuters/Landov