Homeland Security Secretary Janet Napolitano (L) testifies during a Senate Commerce, Science and Transportation Hearing. Ann Heisenfelt/Getty Images hide caption

itoggle caption Ann Heisenfelt/Getty Images

A farmer displays two corncobs from bioengineered seed (right) and two non-GMO corncobs seized with vermin. Sven Kaestner/AP hide caption

itoggle caption Sven Kaestner/AP

Sea cucumber with swan goose meat. Xiao Kaijing for NPR hide caption

itoggle caption Xiao Kaijing for NPR

The markets of Aleppo brim with fresh vegetables and spices. Deborah Amos/NPR hide caption

itoggle caption Deborah Amos/NPR

After the morning milking, the cows head out to graze on the 146-acre farm. Kathleen Masterson/NPR hide caption

itoggle caption Kathleen Masterson/NPR