The debate about sustainable diets has focused on meat production, which requires lots of land and water to grow grain to feed livestock. It also contributes to methane emissions. But the cabinet secretaries with final authority say the 2015 dietary guidelines won't include sustainability goals. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

The "Super-Kamiokande" neutrino detector operated by the University of Tokyo's Institute for Cosmic Ray Research helped scientist Takaaki Kajita win a share of the Nobel Prize in Physics, along with Canadian Arthur B. McDonald. Kyodo /Landov hide caption

itoggle caption Kyodo /Landov

The World Series of Poker main event in Las Vegas in 2014. When Annie competed in this event, just 3 percent of the entrants were women. AP hide caption

itoggle caption AP
Adam Cole/NPR

Modern, domesticated rice comes in a range of colors, usually described as white, red and black. But collectors have never found black grains in more than a thousand samples of wild rice stored in gene banks. Now geneticists have traced this rare grain's origin and spread. Courtesy of Takeshi Ebitani/Takuya Yamaguchi. hide caption

itoggle caption Courtesy of Takeshi Ebitani/Takuya Yamaguchi.

A girl looks away from the body of an assassinated man, who was killed by a gang member in San Salvador. Encarni Pindado for NPR hide caption

itoggle caption Encarni Pindado for NPR

"My brain used to be my best friend," says Greg O'Brien, a journalist with early onset Alzheimer's. But he can't trust it anymore, he says. Alzheimer's is, in some ways, changing who he is. Amanda Kowalski and Samantha Broun for NPR hide caption

itoggle caption Amanda Kowalski and Samantha Broun for NPR