Neonta Williams (left) shares family letters dating back to 1901 with preservationist Kimberly Peach during the Smithsonian's Save our African American Treasures program at the Birmingham Civil Rights Institute. Peach advises her to use archive-quality polyester sleeves to protect the fragile papers, rather than store them in a zip-lock bag. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR

The heirloom corn variety has only eight rows of kernels and hence, its name: New England Eight Row Flint. Courtesy of Stone Barns Center for Food & Agriculture hide caption

itoggle caption Courtesy of Stone Barns Center for Food & Agriculture

A Cherokee purple tomato grown in Alaska in 2011. Sherry Shiesl/Tatiana's TOMATObase hide caption

itoggle caption Sherry Shiesl/Tatiana's TOMATObase