A nearly 70-foot dock that was torn loose from a fishing port in northern Japan by last year's tsunami washed ashore on Agate Beach in Oregon. Marine scientists have found potentially invasive species among the 100 tons of marine life that traveled aboard the dock. Oregon Department of Parks and Recreation/AP hide caption

itoggle caption Oregon Department of Parks and Recreation/AP

A memorial outside Seattle's Cafe Racer on Thursday, a day after a deadly shooting inside. Just a few days later, musicians gathered outside the coffeehouse for an improvised memorial jam session. Stephen Brashear/Getty Images hide caption

itoggle caption Stephen Brashear/Getty Images

Homeland Security analysts watch for threats to U.S. technological infrastructure at the National Cybersecurity and Communications Integration Center. Jim Watson/AFP/Getty Images hide caption

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Demonstrators with Guy Fawkes masks protest changing privacy policies on March 31, in Vienna. Ronald Zak/DAPD/AP hide caption

itoggle caption Ronald Zak/DAPD/AP

In politics, video tracking has become normal. And it's a growth industry. There are trackers working for campaigns, political parties and, increasingly, political action committees. iStockphoto hide caption

itoggle caption iStockphoto

The Seattle Space Needle's 50th anniversary is Saturday. Though the top of the Needle has been off-white for years, it's being painted its original color, "galaxy gold," for the anniversary. Dan Callister/Getty Images hide caption

itoggle caption Dan Callister/Getty Images

Several Web browsers, including Mozilla's Firefox, enable users to request additional privacy online via a "do not track" button. But there's no consensus on how much privacy the button should offer users. Leon Neal/AFP/Getty Images hide caption

itoggle caption Leon Neal/AFP/Getty Images

Protesters demonstrate at City Hall in Seattle on Feb. 16, 2011, after the announcement that police officer Ian Birk would not face charges for the fatal shooting of John T. Williams. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Then-Capt. Brent Clemmer said Staff Sgt. Robert Bales distinguished himself as a team leader in Clemmer's C Company, 2nd Battalion, 3rd Infantry Regiment during the Battle of Zarqa, Iraq. The faces of the rest of Bales' squad have been obscured. Courtesy Maj. Brent Clemmer hide caption

itoggle caption Courtesy Maj. Brent Clemmer