The hard part of making an egg replacement product is coming up with a substitute for the protein in egg whites. Wilson Hui/Flickr hide caption

itoggle caption Wilson Hui/Flickr

Lee Perry-Gal measures chicken long bones at the zooarchaeology lab, Zinman Institute of Archaeology, University of Haifa. Courtesy of Guy Bar-Oz hide caption

itoggle caption Courtesy of Guy Bar-Oz

Cottage cheese peaked in the early 1970s, when the average American ate about 5 pounds of it per year, according to the U.S. Department of Agriculture. iStockphoto hide caption

itoggle caption iStockphoto

Historic yogurt-making cultures held by Mirjana Curic-Bawden. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR
Adolfo Valle for NPR

A bumblebee collects pollen from a flower. New evidence suggests climate change has left bumblebees with a shrinking range of places to live. Yuri Kadobnovy/AFP/Getty Images hide caption

itoggle caption Yuri Kadobnovy/AFP/Getty Images

"Who Gets Kissed" corn is a variety bred in Wisconsin specifically for organic farmers. It's named for an old game. At corn husking time, a lucky person who found a rare ear of corn with red kernels had the right to kiss anyone that he or she chose. Courtesy of Adrienne Shelton hide caption

itoggle caption Courtesy of Adrienne Shelton

Pam Marrone (right), founder and CEO of Marrone Bio Innovations, inspects some colonies of microbes. Marrone has spent most of her professional life prospecting for microbial pesticides and bringing them to market. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

Whole Foods says its new rating system is a way to talk to farmers and customers about issues that the organic rules don't encompass, like water, energy, labor and waste. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

Central Illinois corn and soybean farmer Tim Seifert loads his field planter with Syngenta insecticide while planting seed corn in 2011. Monsanto has made a bid to buy Syngenta for its pesticide business. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP

Tyson Foods says it has already reduced its use of human-use antibiotics by 80 percent over the past four years. Here, Tyson frozen chicken on display at Piazza's market in Palo Alto, Calif., in 2010. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP