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

Purity by Jonathan Franzen Emily Bogle/NPR hide caption

itoggle caption Emily Bogle/NPR
Ariel Zambelich/NPR

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
Ariel Zambelich/NPR