A selection of heirloom potatoes, including Red Erik, Snowball, Cariboo, Purple Peruvian, Caribe and French Red. A sociologist says we value these "edible memories" as a way to connect to the past and try and secure the future of food production. David Cavagnaro/Corbis hide caption

itoggle caption David Cavagnaro/Corbis

The Centers for Disease Control and Prevention estimates that 1 in 68 children has an autism spectrum disorder. Kelvin Murray/Getty Images hide caption

itoggle caption Kelvin Murray/Getty Images

Jonathan Franzen is also the author of Freedom and the essay collection How To Be Alone. Michael Loccisano/Getty Images for HBO hide caption

itoggle caption Michael Loccisano/Getty Images for HBO

Oliver Sacks was an author, physician and a professor of neurology at the New York University School of Medicine. Chris McGrath/Getty Images hide caption

itoggle caption Chris McGrath/Getty Images

Marie Jalowicz Simon survived the Holocaust by hiding with friends and strangers in Berlin. From the private collection of Hermann Simon hide caption

itoggle caption From the private collection of Hermann Simon
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