Children in Il Ngwesi, Kenya, horse around in their schoolyard. Anthony Asael/Via AP Images hide caption

Chef Douglas McMaster is committed to a "zero waste" ethos in his restaurants. Here, he plates up his creations at Silo, his flagship restaurant, in Brighton, England, about an hour south of London. Xavier Buendia/Courtesy of Doug McMaster hide caption

Khaleed Khatib was the videographer for the Oscar-winning Netflix documentary The White Helmets. "This photo was after double tap of aircraft on July 27, 2014," he says, referring to an airstrike followed by another attack. "I don't know how I survived." Fadi al Halabi/Courtesy of Khaleed Khatib hide caption

Syrian refugees at the Zaatari refugee camp on the Jordanian border on 31 May 2017. NurPhoto/Getty Images hide caption

Ticks of the genus Hyalomma, pictured here, are principally responsible for passing on Crimea-Congo hemorrhagic fever to humans. Adam Cuerden hide caption

Dead Canary Islands date palms, killed by red palm weevils, line a road in La Mersa, Tunis, Tunisia. Courtesy of Mark Hoddle/Department of Entomology, University of California Riverside hide caption

Yes, soap is good. It helps dislodge those microbes. But some experts say: Wet your hands first, then add soap. Ulrich Baumgarten/Getty Images hide caption

A scene from MTV Shuga: Down South, the new season of the soap opera that's filming in South Africa this year. Courtesy of Staying Alive Foundation Inc. hide caption

Vegetables were rationed at supermarkets in the U.K. due to poor weather conditions in Europe. Here, lettuce, broccoli and zucchini were rationed at a Tesco store in London. Victoria Jones/PA Images via Getty Images hide caption

Khaleed Khateeb, 21, was the videographer for the Netflix documentary The White Helmets. "This photo was after double tap of aircraft on July 27, 2014," he says, referring to an airstrike followed by another attack. "I don't know how I survived." Fadi al Halabi/Courtesy of Khaleed Khateeb hide caption

Health workers treat a man at a hospital in Idlib, Syria, about 40 miles from Aleppo. Anadolu Agency/Getty Images hide caption

A community counselor, left, speaks to a patient on the Friendship Bench in Zimbabwe. Courtesy of King's College London hide caption