Pew's study found that 60 percent of Americans under 30 used the library in the past year. iStockphoto.com hide caption

Despite having aired its final episode in May, the medical drama House lives on, in reruns and on digital services like Hulu, Netflix and Amazon Prime. But not every episode is available in all formats. Adam Taylor/AP hide caption

Microsoft CEO Steve Ballmer speaks at a Microsoft event in San Francisco in July. This week, Microsoft launches Windows 8, a radical redesign of its operating system, as well as a new set of tablet computers. Jeff Chiu/AP hide caption

Investors and financial analysis firms are increasingly looking at "sentimental analysis" — such as Facebook "likes" and Twitter messages — to gauge a company's social popularity. iStockphoto.com hide caption

Pakistani security personnel stand guard in front of a burnt-out school following an attack by the Pakistani Taliban in the northwestern district of Upper Dir in June 2011. The Taliban have destroyed many schools in northwestern Pakistan. AFP/Getty Images hide caption

A print in The Illustrated London News of Dec. 3, 1864, depicts Election Day in a wealthy (top) and poor (bottom) neighborhood in New York. The top caption reads: "A polling-place in the 'upper ten.' " The bottom caption reads: "A polling-place among the 'lower twenty.' " Click Here To See A Full-Size Image Library of Congress hide caption