Voters in SeaTac, Wash., have narrowly approved a measure raising the minimum wage at its international airport, officials say. But the initiative faces several challenges, including a recount. Elaine Thompson/AP hide caption

itoggle caption Elaine Thompson/AP

The line stretches down the block ahead of an event during the 2012 Seattle Science Festival. The 2013 festival runs from June 6 through June 16. Courtesy of Pacific Science Center hide caption

itoggle caption Courtesy of Pacific Science Center

A young cannabis plant at grows at The Joint Cooperative in Seattle, Washington Jan. 27. Cliff DesPeaux/Reuters/Landov hide caption

itoggle caption Cliff DesPeaux/Reuters/Landov