An Afghan health worker administers polio vaccine drops to a child on the second day of a vaccination campaign in Kabul on March 16, 2015. Nearly nine million children throughout Afghanistan will be immunized during a three-day national polio immunization drive launched on March 15.The immunization campaign comes shortly after Afghanistan reported its first case of polio virus for 2015, in Helmand, in the Southern Region. Afghanistan and Pakistan are the only two countries in the world to have reported cases of the crippling polio virus in the past eight months and it is increasingly likely that these are the last two countries on Earth with active polio transmission

Shah Marai/AFP

A health worker gives polio vaccine drops to a child on the second day of a national campaign in Afghanistan on Monday. Nearly nine million children in the country are being immunised during the three-day programme.

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa...Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa March 13, 2015.

Khaled Abdullah/Reuters

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen’s former President Ali Abdullah Saleh, dance as they demonstrate to demand for a presidential election to be held and for him to run for presidency in Sanaa on Friday

A Royal Air Force Chinook flies over London during a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England. Royals including the Queen and the Duke and Duchess of Cambridge were joined by veterans and families at St Paul's Cathedral for a service commemorating the end of British involvement in the Afghanistan war.

Carl Court/Getty Images

A Royal Air Force Chinook flies over London during a Service of Commemoration for troops who were stationed in Afghanistan on Friday in London, England

A woman cries as she walks past destroyed houses in the town of Debaltseve, north-east from Donetsk, March 13, 2015.

Marko Djurica/Reuters

A woman cries as she walks past destroyed houses in the town of Debaltseve, north-east from Donetsk on Friday

Palestinian children play amidst debris of houses that were destroyed during the 50-day war between Israel and Hamas militants in the summer of 2014, in the Gaza Strip town of Beit Hanun on Friday.

Mohammed Abed/AFP

Palestinian children play amid debris of houses that were destroyed during the 50-day war between Israel and Hamas militants last summer, in the Gaza Strip town of Beit Hanun on Friday

Bangladesh's Nasir Hossain drops a catch from New Zealand's Cory Anderson during their Cricket World Cup match in Hamilton, Friday

Nigel Marple/Reuters

Bangladesh’s Nasir Hossain drops a catch from New Zealand’s Cory Anderson during their Cricket World Cup match in Hamilton, Friday

Police remove a protester holding a sign as U.S. Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on Capitol Hill in Washington...Police remove a protester holding a sign as U.S. Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on "The President's Request for Authorization to Use Force Against ISIS: Military and Diplomatic Efforts" on Capitol Hill in Washington March 11, 2015.

Kevin Lamarque/Reuters

Police remove a protester holding a sign as US Secretary of State John Kerry testifies at a Senate Foreign Relations Committee hearing on “The President’s Request for Authorisation to Use Force Against Isis: Military and Diplomatic Efforts” on Capitol Hill in Washington on Wednesday

Steam rises at night from the cooling towers of the Electricite de France (EDF) nuclear power station in Dampierre-en-Burly. The future of France's nuclear industry has never looked bleaker, with a government pledging to wean the country off atomic power, cut-throat rivalry in world export markets and the debt of flagship nuclear group Areva mired deep in junk territory

Christian Hartmann/Reuters

Steam rises at night from the cooling towers of the Electricité de France (EDF) nuclear power station in Dampierre-en-Burly

Iraqi fighters of the government-controlled Popular Mobilisation units take part in a military operation to take control of Tikrit, 160 kms north of Baghdad,  from jihadists from the Islamic state (IS) group, on March 11 2015.  The city, which is the home town of former president Saddam Hussein, is the toughest target for the government troops and allied militias that started winning back lost ground last year.

Ahmad Al-Rubaye/AFP

Iraqi fighters of the government-controlled Popular Mobilisation units take part in a military operation to take control of Tikrit, 160km north of Baghdad, from jihadists from the Islamic state (IS) group, on Wednesday

Student protesters try to speak to their family members from a prison vehicle as they are transported to a court in Letpadan on Wednesday. Myanmar's opposition National League for Democracy (NLD) demanded an inquiry on Wednesday into clashes between police and protesters in which students, monks and journalists were beaten with batons and more than 100 people were arrested

Soe Zeya Tun/Reuters

Student protesters try to speak to their family members from a prison vehicle as they are transported to a court in Letpadan. Myanmar’s opposition National League for Democracy (NLD) demanded an inquiry on Wednesday into clashes between police and protesters in which students, monks and journalists were beaten with batons and more than 100 people were arrested

Lightning strikes delay the start of play before the round 21 A-League match between the Western Sydney Wanderers and Melbourne City FC at Pirtek Stadium on Wednesday in Sydney, Australia

Matt King/Getty Images

Lightning strikes delay the start of play before the round 21 A-League match between the Western Sydney Wanderers and Melbourne City FC at Pirtek Stadium on Wednesday in Sydney, Australia

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen's former President Ali Abdullah Saleh, raise their rifles as they demonstrate in Sanaa, March 10, 2015. The supporters were demanding for presidential elections to be held and for Ahmed Ali Abdullah Saleh to run for presidency.

Khaled Abdullah/Reuters

Supporters of Ahmed Ali Abdullah Saleh, the son of Yemen’s former President Ali Abdullah Saleh, raise their rifles as they demonstrate in Sanaa on Tuesday. The supporters were demanding for presidential elections to be held and for Ahmed Ali Abdullah Saleh to run for presidency

Race goers check the form on Champion Day, during the Cheltenham Festival at Cheltenham Racecourse. PRESS ASSOCIATION Photo. Picture date: Tuesday March 10, 2015.

David Davies/PA

Racegoers check the form on Champion Hurdle day, the first day of the Cheltenham festival

Myanmar student protesters and nationalists clash with riot police during a march in Letpadan town, some 130 kilometres (80 miles) north of Myanmar's main city on March 10, 2015. Student protesters have embarked on months of demonstrations calling for education reform, but plans by a core group to march to Yangon have been halted by police in the dusty central town of Letpadan, who have surrounded around 150 activists since March 2.

Soe Than Win/AFP

Myanmar student protesters and nationalists clash with riot police during a march in Letpadan town, some 130km (80 miles) north of Myanmar’s main city on Tuesday. Student protesters have embarked on months of demonstrations calling for education reform, but plans by a core group to march to Yangon have been halted by police in the dusty central town of Letpadan

Indian commuters walk in an underpass connecting their neighborhood with a main thoroughfare past a train station in the early hours of the morning in New Delhi on March 10, 2015.  According to a report from the United Nations India's urban population numbers some 410 million people and this will grow to 814 million by 2050. The report from 2014 also states that India is projected to add the highest number of people to its urban population by 2050, ahead of China

Roberto Schmidt/AFP

Indian commuters walk in an underpass connecting their neighbourhood with a main thoroughfare past a train station in the early hours of the morning in New Delhi on Tuesday. According to a report from the UN, India’s urban population numbers some 410m people and this will grow to 814m by 2050

Bangladesh's Nassir Hossain leaps onto team mates in celebration after Bangladesh knocked England out of the tournament in their Cricket World Cup match in Adelaide...Bangladesh's Nassir Hossain (top) leaps onto team mates in celebration after Bangladesh knocked England out of the tournament in their Cricket World Cup match in Adelaide, March 9, 2015.

David Gray/Reuters

Bangladesh’s Nassir Hossain leaps onto team mates in celebration after Bangladesh knocked England out of the tournament in their Cricket World Cup match in Adelaide, on Monday

A visitor passes the inside section of Zhu Jinshi's 'Boat' Installation art is seen at The Rotunda, Exchange Square on Monday in Central, Hong Kong. The public exhibition brings to Hong Kong for the first time a monumental 18-metre long, 7-metre high installation, Boat by Zhu Jinshi, composed of bamboo, cotton and over 12,000 sheets of xuan (rice) paper. Zhu Jinshi is one of China's leading contemporary artists who has offered outstanding contributions to the field across various mediums, including painting, performance art and art installation. Xuan paper has been a major medium in the artist's repertoire since 1988 when, working in Berlin, he produced A Cube of Xuan Paper. Working on monumental site-specific xuan paper installations has been a constant line of exploration for Zhu

Keith Tsuji/Getty Images

A visitor passes inside a section of Zhu Jinshi’s ‘Boat’ Installation art at The Rotunda, Exchange Square on Monday in Hong Kong. The public exhibition brings to Hong Kong for the first time a monumental 18-metre long, 7-metre high installation composed of bamboo, cotton and over 12,000 sheets of xuan (rice) paper

Filipino women have their heads shaved during a rally at the gates of the House of Representatives in suburban Quezon city, north of Manila, Philippines on Monday March 9, 2015. Fifteen women farmers had their heads shaved to protest the alleged failure of the House of Representatives to immediately pass bills that could extend and overhaul the implementation of the Comprehensive Agrarian Reform Program (CARP).

Aaron Favila/AP

Filipina women have their heads shaved during a rally at the gates of the House of Representatives in suburban Quezon city, north of Manila, Philippines on Monday. Fifteen women farmers had their heads shaved to protest against the alleged failure of the House of Representatives to immediately pass bills that could extend and overhaul the implementation of the Comprehensive Agrarian Reform Program (CARP)

A Palestinian boy looks out a bus window as he waits with family to cross into Egypt, at the Rafah crossing between Egypt and the southern Gaza Strip...A Palestinian boy looks out a bus window as he waits with family to cross into Egypt, at the Rafah crossing between Egypt and the southern Gaza Strip March 9, 2015. Egyptian authorities opened the Rafah border crossing on Monday for two days, officials said. Rafah is the only major crossing between impoverished Gaza, home to 1.8 million Palestinians, and the outside world that does not border Israel, which blockades the strip and allows passage mainly on humanitarian grounds. Egypt shut the crossing in October last year after Islamist militants in Egypt's adjacent Sinai region killed members of its security forces. Since then, it opened the crossing partially and on a few occasions to allow thousands of Palestinians to travel in and out of the Gaza Strip.

Suhaib Salem/Reuters

A Palestinian boy looks out a bus window as he waits with family to cross into Egypt, at the Rafah crossing between Egypt and the southern Gaza Strip. Egyptian authorities opened the Rafah border crossing on Monday for two days

Attendants prepare tea for delegates ahead of the second plenary meeting of Chinese People's Political Consultative Conference (CPPCC) at the Great Hall of the People in Beijing...Attendants prepare tea for delegates ahead of the second plenary meeting of Chinese People's Political Consultative Conference (CPPCC) at the Great Hall of the People in Beijing, March 9, 2015.

Kim Kyung-Hoon/Reuters

Attendants prepare tea for delegates ahead of the second plenary meeting of the Chinese People’s Political Consultative Conference (CPPCC) at the Great Hall of the People in Beijing on Monday