An economist with the Rand Corporation argues that Los Angeles' fast-food ban failed because it merely blocked new construction or expansion of "stand-alone fast-food" restaurants in neighborhoods where that style of restaurant was uncommon to begin with. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

Rows of potted cocoa plants from around the world. Before a cocoa variety from one country can be planted in another, it first makes a pit stop here, at a quarantine center in rural England. Courtesy of Dr. Andrew J. Daymond hide caption

itoggle caption Courtesy of Dr. Andrew J. Daymond

Mas Masumoto grew up on his family farm southeast of Fresno, Calif. His 1987 essay "Epitaph for A Peach," in which he bemoaned the loss of heirloom flavors, captured his changing philosophy as a farmer. It also helped turn his farm into a landmark in the local-food movement. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

An illustration from a book published in 1851 depicts the cultivation of tea in China. In the mid-19th century, China controlled the world's tea production. That soon changed, thanks to a botanist with a penchant for espionage. Internet Archive hide caption

itoggle caption Internet Archive

Jack Bishop says it's the soy sauce in the Mushroom Bolognese that really makes it pop. Joe Keller/Courtesy of America's Test Kitchen hide caption

itoggle caption Joe Keller/Courtesy of America's Test Kitchen