A supporter holds up a sign as former Alaska Gov. Sarah Palin speaks during the Tea Party of America's "Restoring America" event at the Indianola Balloon Festival Grounds in Indianola, Iowa. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

Many parents today expect to have choices — and that includes picking and choosing which vaccines their children gets. iStockphoto.com hide caption

itoggle caption iStockphoto.com

The U.S. Coast Guard Cutter Healy breaks ice to support scientific research in the Arctic Ocean near Barrow, Alaska, in this file photo from July 2006 provided by the Coast Guard. In addition to the medium-class Healy, the U.S. just has two polar-class icebreakers — one of which will be decommissioned soon. Prentice Danner/AP hide caption

itoggle caption Prentice Danner/AP

In this July 27 file photo, Sen. Patty Murray speaks as Senate Majority Leader Harry Reid listens at a news conference on Capitol Hill. Reid announced earlier this month he's naming Murray to co-chair a powerful supercommittee charged with finding more than $1 trillion in deficit cuts this fall. J.Scott Applewhite/AP hide caption

itoggle caption J.Scott Applewhite/AP

Washington Department of Transportation surveyors Mark McDonald (left) and Richard Torres work atop Alaskan Way Viaduct in downtown Seattle in 2009. The viaduct, which was constructed in the 1950s, is slated to be replaced by a deep-bore tunnel. A 2001 earthquake seriously weakened the structure, and engineers say another hard shake could bring it down. Stephen Brashear/Getty Images hide caption

itoggle caption Stephen Brashear/Getty Images

Today, Seattle's Pike Place Market is a bustling tourist spot — where visitors come to buy lattes at the original Starbucks and watch vendors throw fish. But in the late 1970s, the market was a dicier place. And Lowen Clausen — a Seattle cop turned Seattle crime writer — would know. papalars via Flickr hide caption

itoggle caption papalars via Flickr

The Dalles Dam along the Columbia River, in Dalles, Ore. Five wind power companies asked federal regulators June 13 to stop the region's main transmission utility from shutting them down at night. Rick Bowmer/AP hide caption

itoggle caption Rick Bowmer/AP

A screen shot of Google Plus.   hide caption

itoggle caption  

In central Idaho, local hostility to wolves expresses itself on signs along the highway. Many residents don't like the wolves because the animals kill elk, livestock and pets. Martin Kaste/NPR hide caption

itoggle caption Martin Kaste/NPR

Libyans wait in line at a bank in Benghazi in February. The National Transitional Council in the rebel-held city is continuing to pay government salaries and unemployment stipends. Hussein Malla/AP hide caption

itoggle caption Hussein Malla/AP