Syrian refugees are pictured at Kilis refugee camp in Gaziantep, Turkey, on Nov. 1. An estimated 150,000 Syrians are reported to be living in the Turkish border town. Maurizio Gambarini/DPA/Landov hide caption

itoggle caption Maurizio Gambarini/DPA/Landov

Demonstrators wave Syrian opposition flags during a protest in Istanbul against the government of Syria's President Bashar Assad, on March 15. Osman Orsal/Reuters /Landov hide caption

itoggle caption Osman Orsal/Reuters /Landov

An Islamist rebel group in Aleppo called "the Authority for the Promotion of Virtue and Supporting the Oppressed" reviews applications for aid on Feb. 25. In addition to handing out aid, the Islamist group says it is carrying out civilian administration in parts of Aleppo. Hamid Khatib/Reuters/Landov hide caption

itoggle caption Hamid Khatib/Reuters/Landov

Ahmad "Harvester" Heidar is a computer software engineer whose work for the Syrian rebels includes sweeping the hard drives of detained anti-government activists, and trying to develop a robot that will help extract sniper victims in Syria. Turkish officials have given Heidar the green light to develop a prototype of his robot, which he calls Tina. Jodi Hilton for NPR hide caption

itoggle caption Jodi Hilton for NPR

Syrians carry a large revolution flag and chant slogans during a protest in Aleppo, Syria, where young people and children sang songs against President Bashar Assad and the Syrian regime, Dec. 21, 2012. Virginie Nguyen Hoang/AP hide caption

itoggle caption Virginie Nguyen Hoang/AP

Syrian rebels celebrate in a street in the northeastern Syrian city of Raqqah after capturing the provincial capital on March 4. The government has responded with air strikes, creating a new wave of refugees. Mohammad Al-Hussein /AFP/Getty Images hide caption

itoggle caption Mohammad Al-Hussein /AFP/Getty Images

As Aleppo residents in the Tariq al-Bab district recover from this week's attack by Syrian regime forces, delegates from the city are in Turkey holding an election for local officials. AFP/AFP/Getty Images hide caption

itoggle caption AFP/AFP/Getty Images

Secular demonstrators, shown at a protest march this month in Aleppo, wave the old Syrian flag (green, white, black and red) that has become the symbol of their opposition movement. Aamir Qureshi/AFP/Getty Images hide caption

itoggle caption Aamir Qureshi/AFP/Getty Images

Syrian people wait at a customs gate at the Turkey-Syria border near Reyhanli, Turkey, last week. Hundreds of thousands of people are fleeing central Syria, heading to southern Turkey. Gaia Anderson/AP hide caption

itoggle caption Gaia Anderson/AP