Soldiers practice roll-over drills ahead of their deployment to Afghanistan at Joint Base Elmendorf-Richardson. Zachariah Hughes/Alaska Public Media hide caption

Earthquake survivors look at a collapsed building in Istanbul in August 1999. The magnitude 7.4 quake killed 17,000 people across northwestern Turkey. Eyal Warshavsky/AP hide caption

Brandi Chastain celebrates after scoring the winning goal of the 1999 World Cup. Hector Mata/AFP/Getty Images hide caption

Twins Heloisa (left) and Heloa Barbosa, both born with microcephaly, had a one-year birthday party on April 16 in Areia, Brazil. Their mother says she contracted the Zika virus during pregnancy. Mario Tama/Getty Images hide caption

In 2011, the Food and Drug Administration sent an advisory about an outbreak of listeria linked to cantaloupes killed 33 people. Gosia Wozniacka/AP hide caption

As in the rest of the country, growers in heavily agricultural northern Michigan rely overwhelmingly on migrant laborers to work the fields and orchards. Most of the pickers are from Mexico. Growers say it's just about impossible to find Americans to do this work. Melissa Block/NPR hide caption

An artist's depiction of two black holes colliding. NASA hide caption

The main square of Batea, a town of about 2,000 residents in Spain's northeast region of Catalonia. The mayor opposes Sunday's independence referendum and has not given permission for voting to take place in municipal buildings. Lauren Frayer for NPR hide caption

German grocers Aldi and Lidl are aggressively growing their U.S. footprint. Aldi, which aims to have 2,500 stores by 2022, has recently renovated this store (left) in Alexandria, Va. And Lidl's new location in Manassas, Va., was its 30th in the country. Alina Selyukh/NPR hide caption