A Syrian refugee boy stands behind a fence near his family makeshift home tent, as the rainbow shines in background, at Zaatari refugee camp, near the Syrian border, in Mafraq, Jordan, Thursday, March 13, 2014. The Syrian conflict, now entering its fourth year, has killed more than 140,000 people, sent more than 2.5 million fleeing for neighboring countries and destroyed entire blocks in opposition-held areas of the country.(AP Photo/Mohammad Hannon)
A Syrian refugee boy stands behind a fence near his family makeshift home tent, as the rainbow shines in background, at Zaatari refugee camp, near the Syrian border, in Mafraq, Jordan, Thursday, March 13, 2014. The Syrian conflict, now entering its fourth year, has killed more than 140,000 people, sent more than 2.5 million fleeing for neighboring countries and destroyed entire blocks in opposition-held areas of the country.(AP Photo/Mohammad Hannon)
A Palestinian rides his bicycle near graffiti of rockets and militants in Gaza City, in the northern Gaza Strip, Thursday, March 13, 2014. Gaza militants resumed their rocket fire toward Israel on Thursday, striking the outskirts of two major cities a day after launching the largest barrage since an eight-day Israeli offensive in late 2012. Gaza militant groups said they resumed their rocket fire in response to what they say are Israeli
A Palestinian rides his bicycle near graffiti of rockets and militants in Gaza City, in the northern Gaza Strip, Thursday, March 13, 2014. Gaza militants resumed their rocket fire toward Israel on Thursday, striking the outskirts of two major cities a day after launching the largest barrage since an eight-day Israeli offensive in late 2012. Gaza militant groups said they resumed their rocket fire in response to what they say are Israeli "provocations" and violations of a cease-fire, including an airstrike that killed three Islamic Jihad militants earlier this week. (AP Photo/Adel Hana)
Passengers evacuate US Airways Flight 1702 after the pilot was forced to abort takeoff shortly after 6 p.m., after a tire on the plane's front landing gear blew out, Thursday, March 13, 2014, in Philadelphia. The Airbus A320 jet, bound for Fort Lauderdale, Fla., was carrying 149 passengers and five crew members, airport spokeswoman Victoria Lupica said. All were rescheduled on departing flights Thursday night, she said. (AP Photo/Dennis Fee)
Passengers evacuate US Airways Flight 1702 after the pilot was forced to abort takeoff shortly after 6 p.m., after a tire on the plane's front landing gear blew out, Thursday, March 13, 2014, in Philadelphia. The Airbus A320 jet, bound for Fort Lauderdale, Fla., was carrying 149 passengers and five crew members, airport spokeswoman Victoria Lupica said. All were rescheduled on departing flights Thursday night, she said. (AP Photo/Dennis Fee)
A child plays soccer in front a mural of Pope Francis at the 1-11-14 slum in Buenos Aires, Argentina, Thursday, March 13, 2014. On the day of the first anniversary of the Pope's election, people from the 1-11-14 slum gather at the their church to attend a mass given in his honor and to watch an interview that Pope Francis gave recently from his residence at the Vatican to FM Bajo Flores, a community radio station that broadcasts from the slum. (AP Photo/Natacha Pisarenko)
A child plays soccer in front a mural of Pope Francis at the 1-11-14 slum in Buenos Aires, Argentina, Thursday, March 13, 2014. On the day of the first anniversary of the Pope's election, people from the 1-11-14 slum gather at the their church to attend a mass given in his honor and to watch an interview that Pope Francis gave recently from his residence at the Vatican to FM Bajo Flores, a community radio station that broadcasts from the slum. (AP Photo/Natacha Pisarenko)
A member of a pro-Russian self defense unit checks a polling station while guarding it in the municipality of Dobroe, near Simferopol, Ukraine,Thursday, March 13, 2014. In a last-minute bid to stave off a new chapter in the East-West crisis over Ukraine, Secretary of State John Kerry warned Russia on Thursday that it faces immediate and
A member of a pro-Russian self defense unit checks a polling station while guarding it in the municipality of Dobroe, near Simferopol, Ukraine,Thursday, March 13, 2014. In a last-minute bid to stave off a new chapter in the East-West crisis over Ukraine, Secretary of State John Kerry warned Russia on Thursday that it faces immediate and "very serious" sanctions if it annexes Ukraine's strategic Crimea region. The warnings from the West served as a last attempt to head off a confrontation over Crimea, which holds a vote Sunday on whether to break off from Ukraine and perhaps join Russia. (AP Photo/Manu Brabo)
An Afghan man rides his bicycle, left, as others walk in a street in downtown Kabul, Afghanistan, Thursday, March 13, 2014. The war-torn country faces the challenges of poverty, unemployment and a lack of infrastructure. (AP Photo/Massoud Hossaini)
An Afghan man rides his bicycle, left, as others walk in a street in downtown Kabul, Afghanistan, Thursday, March 13, 2014. The war-torn country faces the challenges of poverty, unemployment and a lack of infrastructure. (AP Photo/Massoud Hossaini)
An art piece titled “Mil grullas de papel,” or
An art piece titled “Mil grullas de papel,” or "A Thousand Paper Cranes," hangs in the Museo del Objeto del Objeto, MODO, during the inauguration of the traveling exhibit, “The Museum of Broken Relationships,” in Mexico City, Wednesday, March 12, 2014. The exhibit is a collection of donated objects symbolic of broken relationships. The paper birds were donated by a Mexican student who received them from her ex-boyfriend as a parting gift to wish her luck, two days after they broke up. (AP Photo/Isaac Garrido)