Workers at the Cadbury chocolate factory in Bournville, England, join together chocolate Easter egg halves. Cadbury’s cream-filled eggs were first introduced in 1923. Fox Photos/Hulton Archive hide caption

itoggle caption Fox Photos/Hulton Archive

Maria Dominguez picks Gala apples in an orchard in Wapato, Wash., in 2007. Shannon Dininny/AP hide caption

itoggle caption Shannon Dininny/AP

A man shops for milk powder at a supermarket in Guangzhou, south Guangdong Province, on Aug. 12. In 2008, melamine in Chinese milk powder caused the deaths of at least six children and made nearly 300,000 children ill. Now some Chinese say they're choosing foods more carefully. Imaginechina via AP Images hide caption

itoggle caption Imaginechina via AP Images

Tyrone Harvey, 43, of Washington, left, talks with his doctor Gail Nunlee-Bland, M.D., about his diabetes. Harvey uses a cell phone to help manage his disease. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Wheat prices spiked this past summer as a record drought and heat wave wreaked havoc on Russia and ruined one fourth of the country's crops. Russian Prime Minister Vladimir Putin ordered a ban on exports of Russian grain. A self-propelled combine harvests a field in a village south of Moscow on Aug. 15. Yuri Kadobnov/AFP/Getty Images hide caption

itoggle caption Yuri Kadobnov/AFP/Getty Images

Harold McGee writes that the flavor of most vegetables exists to deter others from eating them — which may explain the pungency of mustard greens. iStockphoto.com hide caption

itoggle caption iStockphoto.com