Levees, like this one in New Orleans, must be certified by the U.S. Army Corps of Engineers before appearing on federal flood maps. This change has resulted in higher flood insurance premiums in some areas. Mario Tama/Getty Images hide caption

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Should you fear a chemical inside metal food containers like the ones that hold beans? Government scientists say no. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Chicago is the heroin hub for the Midwest, with cartels often using stash houses in quiet, residential neighborhoods like this one on the city's Southwest Side. Bill Healy/WBEZ hide caption

itoggle caption Bill Healy/WBEZ

A customer smells a strain of marijuana while being helped by employee Billy Archilla inside the retail marijuana shop at 3D Cannabis Center in Denver. Brennan Linsley/AP hide caption

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Trucks dump trash at the Puente Hill Landfill in Puente Hills, Calif., on October 31, 2013. The nation's largest landfill is now covered with soil and closed, and will one day be a park. Nick Ut/AP hide caption

itoggle caption Nick Ut/AP

Protesters line up outside City Hall in Oakland, Calif., to demonstrate against the Domain Awareness Center, a data integration system being built by the city and the Port of Oakland. Martin Kaste/NPR hide caption

itoggle caption Martin Kaste/NPR

A case against the Swiss bank UBS in 2008 led Congress to create more regulations for foreign banks holding American money. Rather than comply, many banks opted to stop serving American account-holders. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images

(From left) Incandescent, CFL and LED light bulbs. Many people are finding that choosing the right light bulb has a steep learning curve. iStockphoto hide caption

itoggle caption iStockphoto

Good things come in small packages. Lacy Williams, an architecture student, and her boyfriend, Patrick Beseda, built a WikiHouse to live in during a field project in Utah. Patrick Beseda and Lacy Williams hide caption

itoggle caption Patrick Beseda and Lacy Williams

After contracting meningitis B, Andy Marso had all of his toes and all but one finger amputated. Courtesy of Andy Marso hide caption

itoggle caption Courtesy of Andy Marso