South Koreans watch North Korean leader Kim Jong Un's televised New Year's address, at the Seoul Railway Station on Monday. Kim said the United States should be aware that his country's nuclear forces are now a reality, not a threat. Lee Jin-man/AP hide caption
Iranian students scuffle with police at the University of Tehran on Saturday during a demonstration driven by anger over economic problems. Stringer/AFP/Getty Images hide caption
Marjan practices at the Afghanistan National Institute of Music in Kabul. Rachel Corner/De Beeldunie hide caption
U.S. reconnaissance images show a North Korean ship, the Rye Song Gang 1, conducting a ship-to-ship transfer, possibly of oil, in an effort to evade sanctions on Oct. 19. South Korea has seized a ship it suspects of participating in such transfers. U.S. Treasury Department hide caption
President Trump and North Korean leader Kim Jong Un are expected to continue to square off in 2018. Evan Vucci, Wong Maye-E/AP hide caption
Corals around the world have been dying because of warming waters and pollution. Some researchers hope they can reverse the trend by growing new corals in the lab. Albert Kok/Wikimedia Commons hide caption
A photo released by North Korea's official Korean Central News Agency (KCNA) on May 15 shows North Korean leader Kim Jong Un reacting during a test launch of a ballistic rocket. Reuters has identified the man at Kim's right, with one hand on the table, as Ri Pyong Chol, and the man immediately behind Kim, looking toward the side, as Kim Jong Sik. STR/AFP/Getty Images hide caption
Jadav Payeng, "The Forest Man of India," has planted tens of thousands of trees over the course of nearly 40 years. He has made bloom a once desiccated island that lies in the Brahamputra river, which runs through his home state of Assam. Furkan Latif Khan/NPR hide caption
U.S. Ambassador Nikki Haley on Friday votes in favor of a U.N. Security Council resolution calling for new sanctions against North Korea, including sharply lower limits on its refined oil imports, the return home of all North Koreans working overseas within 12 months and a crackdown on the country's shipping. Mark Lennihan/AP hide caption
The East Khasi Hills, of Meghalaya, is one of the seven small states of India's remote northeast region, and home to the "Cleanest Village in India." The mountain road climbs to Mawlynnong, at an altitude of 5,000 feet, giving way to Bangladesh farther south. Julie McCarthy/NPR hide caption