Britain's Prime Minister David Cameron speaks with a worker as he views a military aircraft during his visit to BAE Systems in Preston...Britain's Prime Minister David Cameron (L) speaks with worker Sam Barrett as he views a military aircraft during his visit to BAE Systems, in Preston, northern England March 12, 2015. REUTERS/Lynne Cameron/pool   (BRITAIN - Tags: POLITICS MILITARY BUSINESS EMPLOYMENT)

Lynne Cameron/PA

Britain’s Prime Minister David Cameron speaks with worker Sam Barrett as he views a military aircraft during his visit to BAE Systems, in Preston, northern England. 

Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne's Albert Park Track...Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne's Albert Park Track, March 12, 2015.   (Top Row, L to R) Mercedes driver Lewis Hamilton of Britain, Mercedes driver Nico Rosberg of Germany, Red Bull driver Daniel Ricciardo of Australia, Red Bull driver Daniil Kvyat of Russia, Williams driver Felipe Massa of Brazil, Williams driver Valtteri Bottas of Finland, Ferrari driver Sebastian Vettel of Germany, Ferrari driver Kimi Raikkonen of Finland, McLaren driver Kevin Magnussen of Denmark and McLaren driver Jenson Button of Britain. (Bottom Row, L to R) Force India driver Nico Hulkenberg of Germany, Force India driver Sergio Perez of Mexico, Toro Rosso driver Max Verstappen of the Netherlands, Toro Rosso driver Carlos Sainz Jr of Spain, Lotus driver Romain Grosjean of France, Lotus driver Pastor Maldonado of Venezuela, Sauber driver Marcus Ericsson of Sweden, Sauber driver Felipe Nasr of Brazil, Marussia driver Will Stevens of Britain and Marussia driver Roberto Merhi of Spain.   REUTERS/Brandon Malone (AUSTRALIA  - Tags: SPORT MOTORSPORT F1)

Brandon Malone/Reuters

Formula One drivers for the 2015 season are pictured in this combination photo at Melbourne’s Albert Park Track, Australia. (Top Row, L to R) Mercedes driver Lewis Hamilton of Britain; Mercedes driver Nico Rosberg of Germany; Red Bull driver Daniel Ricciardo of Australia; Red Bull driver Daniil Kvyat of Russia; Williams driver Felipe Massa of Brazil; Williams driver Valtteri Bottas of Finland; Ferrari driver Sebastian Vettel of Germany; Ferrari driver Kimi Raikkonen of Finland; McLaren driver Kevin Magnussen of Denmark; and McLaren driver Jenson Button of Britain. (Bottom Row, L to R) Force India driver Nico Hulkenberg of Germany; Force India driver Sergio Perez of Mexico; Toro Rosso driver Max Verstappen of the Netherlands; Toro Rosso driver Carlos Sainz Jr of Spain; Lotus driver Romain Grosjean of France; Lotus driver Pastor Maldonado of Venezuela; Sauber driver Marcus Ericsson of Sweden; Sauber driver Felipe Nasr of Brazil; Marussia driver Will Stevens of Britain; and Marussia driver Roberto Merhi of Spain.

A homeless man sleeps under a graffiti i...A homeless man sleeps under a graffiti in central Athens on March 12, 2015. Greece and its international creditors prepare to kick off fiscal talks in Athens on March 12, 2015, breaking a six-week impasse on how to extend the country's huge EU-IMF bailout and restore the flow of loans to avert a state cash shortage. AFP PHOTO/ LOUISA GOULIAMAKILOUISA GOULIAMAKI/AFP/Getty Images

Louisa Gouliamaki/AFP/Getty

A homeless man sleeps under a graffiti in central Athens. Greece and its international creditors prepare to kick off fiscal talks in Athens on Thursday, breaking a six-week impasse on how to extend the country’s huge EU-IMF bailout and restore the flow of loans to avert a state cash shortage. 

TOPSHOTS The Soyuz TMA-14M spacecraft is...TOPSHOTS The Soyuz TMA-14M spacecraft is seen as it lands with Expedition 42 commander Barry Wilmore of NASA, Alexander Samokutyaev of the Russian Federal Space Agency (Roscosmos) and Elena Serova of Roscosmos near the town of Zhezkazgan, Kazakhstan on Thursday, March 12, 2015. NASA Astronaut Wilmore, Russian Cosmonauts Samokutyaev and Serova are returning after almost six months onboard the International Space Station where they served as members of the Expedition 41 and 42 crews.   AFP PHOTO / NASA / BILL INGALLS    == RESTRICTED TO EDITORIAL  USE / MANDATORY CREDIT:  "AFP PHOTO /   NASA / BILL INGALLS"/  NO A LA CARTE SALES  / NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS ==BILL INGALLS/AFP/Getty Images

Bill Ingalls/AFP/Getty

The Soyuz TMA-14M spacecraft is seen as it lands with Expedition 42 commander Barry Wilmore of Nasa, Alexander Samokutyaev of the Russian Federal Space Agency (Roscosmos) and Elena Serova of Roscosmos near the town of Zhezkazgan, Kazakhstan. The crew are returning after almost six months on board the International Space Station where they served as members of the Expedition 41 and 42. 

Children draw on the sidewalk with chalk outside the Ferguson Police Department on March11, 2015 in Ferguson, MO. Protests erupted after the announcement of the resignation of Ferguson Police Chief Tom Jackson earlier in the day. (Photo by Michael B. Thomas/Getty Images)

Michael B. Thomas/Getty

Children draw on the sidewalk with chalk outside the Ferguson Police Department on Wednesday Missouri. Protests erupted after the announcement of the resignation of Ferguson Police Chief Tom Jackson earlier in the day. 

Protesters gather in central Brussels during a trade unions meeting...Protesters gather in central Brussels during a trade unions meeting March 11, 2015. Several thousand public and private sector workers, employees and trade union members demonstrated over austerity measures undertaken by the Belgian government. REUTERS/Yves Herman (BELGIUM - Tags: POLITICS BUSINESS)

Yves Herman/Reuters

Protesters gather in central Brussels during a trade unions meeting on Wednesday. Several thousand public and private sector workers, employees and trade union members demonstrated over austerity measures undertaken by the Belgian government. 

The Moerai School choir gather as they w...The Moerai School choir gather as they wait to sing the national anthem and raise the national flag during a visit by French Overseas Territories Minister George Pau-Langevin on March 10, 2015 on the island of Rurutu, south of Tahiti, on her first official visit to the Indian Ocean territory. AFP PHOTO / GREGORY BOISSYGREGORY BOISSY/AFP/Getty Images

Gregory Boissy/AFP/Getty

The Moerai School choir gather as they wait to sing the national anthem and raise the national flag during a visit by French Overseas Territories Minister George Pau-Langevin on the island of Rurutu, south of Tahiti, French Polynesia. 

Supporters of Ahmed Ali Abdullah Saleh, the son of former Yemeni President Ali Abdullah Saleh, gather at the Monument of the Unknown Soldier during a demonstration demanding presidential elections be held and the younger Saleh run for the office, in Sanaa, Yemen, Tuesday, March 10, 2015. (AP Photo/Hani Mohammed)

Hani Mohammed/AP

Supporters of Ahmed Ali Abdullah Saleh, the son of former Yemeni President Ali Abdullah Saleh, gather at the Monument of the Unknown Soldier during a demonstration demanding presidential elections be held and the younger Saleh run for the office, in Sanaa, Yemen

TO GO WITH AFP STORY BY ADEL ZAANOUN - F...TO GO WITH AFP STORY BY ADEL ZAANOUN - FILES - Palestinian militants from the Islamic Jihad's armed wing, the Al-Quds Brigades, squat in a tunnel, used for ferrying rockets and mortars back and forth in preparation for the next conflict with Israel, as they take part in military training in the south of the Gaza Strip on March 3, 2015. Israel's ground invasion during the 50-day war with Palestinian militants in the summer of 2014 was aimed at destroying the hundreds of tunnels Gaza's two main Islamist groups had built, both for smuggling supplies and for attacks inside Israel. AFP PHOTO / MAHMUD HAMSMAHMUD HAMS/AFP/Getty Images

Mahmud Hams/AFP/Getty

Militants from the Palestinian Islamic Jihad’s armed wing, the Al-Quds Brigades, squat in a tunnel used for ferrying rockets and mortars back and forth as they take part in military training in the south of the Gaza Strip 

A Tibetan man carries a portrait of exiled Tibetan spiritual leader, the Dalai Lama, during a function to mark the 56th Tibetan Uprising Day at the Tibetan Refugee camp in Lalitpur...A Tibetan man carries a portrait of exiled Tibetan spiritual leader, the Dalai Lama, during the function to mark the 56th Tibetan Uprising Day at the Tibetan Refugee camp in Lalitpur March 10, 2015. With a growing Chinese influence over Nepal, the Nepalese government stands strong against Tibetan exiles protesting in support of their homeland. Nepal ceased issuing refugee papers to Tibetans in 1989 and recognizes Tibet to be a part of China. REUTERS/Navesh Chitrakar (NEPAL - Tags: RELIGION POLITICS)

Navesh Chitrakar/Reuters

A man carries a portrait of the Dalai Lama, the exiled Tibetan spiritual leader, during a function at the Tibetan refugee camp in Lalitpur to mark the 1959 uprising against the presence of China in Tibet

REUTERS PICTURE HIGHLIGHT...ATTENTION EDITORS - REUTERS PICTURE HIGHLIGHT TRANSMITTED BY 1419 GMT ON MARCH 9, 2015    KAB01  Afghan policemen display their skills at a police training centre in Nangarhar Province March 9, 2015.   REUTERS/Parwiz     REUTERS NEWS PICTURES HAS NOW MADE IT EASIER TO FIND THE BEST PHOTOS FROM THE MOST IMPORTANT STORIES AND TOP STANDALONES EACH DAY. Search for "TPX" in the IPTC Supplemental Category field or "IMAGES OF THE DAY" in the Caption field and you will find a selection of 80-100 of our daily Top Pictures.    REUTERS NEWS PICTURES.     TEMPLATE OUT

Parwiz/Reuters

Afghan policemen display their skills at a police training centre in Nangarhar Province. 

A man carries a dummy elephant in the streets downtown of Guatemala City March 8, 2015.   REUTERS/Jorge Dan Lopez (GUATEMALA - Tags: SOCIETY)

Jorge Dan Lopez/Reuters

A man carries a dummy elephant in the downtown streets of Guatemala City 

A woman reacts as she looks at a damaged church in Donetsk's Oktyabrski district...A woman reacts as she looks at a damaged church in Donetsk's Oktyabrski district, March 9, 2015. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT)A woman reacts as she looks at a damaged church in Donetsk's Oktyabrski district...A woman reacts as she looks at a damaged church in Donetsk's Oktyabrski district, March 9, 2015. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST CONFLICT)

Marko Djurica/Reuters

A woman reacts as she looks at a damaged church in Donetsk’s Oktyabrski district, Ukraine.

Male civil society members wear burqas to protest violence against women, ahead of International Women's Day, in Kabul, Afghanistan, Thursday, March 5, 2015. (AP Photo/Massoud Hossaini)

Massoud Hossaini/AP

Male civil society members wear burqas to protest violence against women, ahead of International Women’s Day, in Kabul, Afghanistan

Becky Watts' Stepbrother Is Charged With Her Murder...BRISTOL, ENGLAND - MARCH 05:  Police officers stand outside the vehicle entrance after a van said to be carrying Nathan Matthews entered Bristol Magistrates Court on March 5, 2015 in Bristol, England. The search for teenager Becky Watts ended when police investigating her disappearance found body parts at a house in Bristol. Her stepbrother Nathan Matthews has been charged with her murder whilst his girlfriend has been charged with attempting to pervert the course of justice.  (Photo by Matt Cardy/Getty Images)

Matt Cardy/Getty

Police officers stand outside the vehicle entrance after a van said to be carrying Nathan Matthews entered Bristol Magistrates Court in Bristol, England. The search for teenager Becky Watts ended when police investigating her disappearance found body parts at a house in Bristol. Her stepbrother Nathan Matthews has been charged with her murder whilst his girlfriend has been charged with attempting to pervert the course of justice. 

Nadezhda Savchenko...Ukrainian jailed military officer Nadezhda Savchenko, center, reacts as she listens to the court's decision in a cage at a court room in Moscow, Russia, Wednesday, March 4, 2015. A Russian court has rejected an appeal to release a Ukrainian pilot who has been on hunger strike since mid-December. The case of Nadezhda Savchenko has attracted high attention in recent weeks as concerns rise about her health. (AP Photo/Ivan Sekretarev)

Ivan Sekretarev/AP

Ukrainian jailed military officer Nadezhda Savchenko, centre, reacts as she listens to the court’s decision in a cage at a court room in Moscow, Russia. A Russian court has rejected an appeal to release a Ukrainian pilot who has been on hunger strike since mid-December. The case of Nadezhda Savchenko has attracted high attention in recent weeks as concerns rise about her health. 

An Indian army recruit wearing ceremonial uniform looks during passing out parade at garrison in Rangreth on outskirts of Srinagar...An Indian army recruit wearing his ceremonial uniform looks on as he marches during their passing out parade at a garrison in Rangreth on the outskirts of Srinagar March 4, 2015. A total of 179 youths from various religious backgrounds were formally inducted into the Indian army's Jammu and Kashmiri Light Infantry Regiment (JKLIR) after their 49 week training, an army official said.  REUTERS/Danish Ismail (INDIAN-ADMINISTERED KASHMIR - Tags: MILITARY TPX IMAGES OF THE DAY)

Danish Ismail/Reuters

An Indian army recruit in ceremonial uniform looks on during a passing out parade at a garrison in Rangreth on the outskirts of Srinagar. A total of 179 youths were formally inducted into the Indian army’s Jammu and Kashmiri Light Infantry Regiment (JKLIR) 

REUTERS PICTURE HIGHLIGHT...ATTENTION EDITORS - REUTERS PICTURE HIGHLIGHT TRANSMITTED BY 0730 GMT ON MARCH 4, 2015    DSB01  Buddhist monks prepare for an alms offering ceremony at the Wat Phra Dhammakaya temple in Pathum Thani province, north of Bangkok as the sun rises on Makha Bucha Day, March 4, 2015.   REUTERS/Damir Sagolj     REUTERS NEWS PICTURES HAS NOW MADE IT EASIER TO FIND THE BEST PHOTOS FROM THE MOST IMPORTANT STORIES AND TOP STANDALONES EACH DAY. Search for "TPX" in the IPTC Supplemental Category field or "IMAGES OF THE DAY" in the Caption field and you will find a selection of 80-100 of our daily Top Pictures.    REUTERS NEWS PICTURES.     TEMPLATE OUT

Damir Sagolj/Reuters

Buddhist monks prepare for an alms offering ceremony at the Wat Phra Dhammakaya temple in Pathum Thani province, north of Bangkok as the sun rises on Makha Bucha Day 

REUTERS PICTURE HIGHLIGHT...ATTENTION EDITORS - REUTERS PICTURE HIGHLIGHT TRANSMITTED BY 0555GMT ON MARCH 4, 2015    IA204  Smoke and lava spew from the Villarrica volcano, as seen from Pucon town in the south of Santiago, March 3, 2015. The volcano went quiet on Tuesday after an eruption that sent a plume of ash and lava high into the sky in the early hours put Chile on high alert. REUTERS/Claudia Bucarey    REUTERS NEWS PICTURES HAS NOW MADE IT EASIER TO FIND THE BEST PHOTOS FROM THE MOST IMPORTANT STORIES AND TOP STANDALONES EACH DAY. Search for "TPX" in the IPTC Supplemental Category field or "IMAGES OF THE DAY" in the Caption field and you will find a selection of 80-100 of our daily Top Pictures.    REUTERS NEWS PICTURES.     TEMPLATE OUT

Reuters

Smoke and lava spew from the Villarrica volcano, as seen from Pucon town in the south of Santiago. The volcano went quiet on Tuesday after an eruption that sent a plume of ash and lava high into the sky in the early hours put Chile on high alert. 

Enrique Pena Nieto Queen Elizabeth...The President of Mexico Enrique Pena Nieto, left,  views Mexican items in the Royal Collection with Britain's Queen Elizabeth II, right, at Buckingham Palace, London, during the first day of a three-day state visit to Britain. (AP Photo/ Jonathan Brady/Pool)

Jonathan Brady/AP

The President of Mexico Enrique Peña Nieto, left, views Mexican items in the Royal Collection with Britain’s Queen Elizabeth II, right, at Buckingham Palace, London, during the first day of a three-day state visit to Britain.