Mask

Members of the Iraqi Special Operations Forces (ISOF) prepare before going out on a patrol in the town of Jurf al-Sakhar, south of Baghdad, June 30, 2014. Iraqi troops battled to dislodge an al Qaeda splinter group from the city of Tikrit on Monday after its leader was declared caliph of a new Islamic state in lands seized this month across a swathe of Iraq and Syria. Alarming regional and world powers, the Islamic State of Iraq and the Levant (ISIL) claimed universal authority when it dropped the local element in its name and said its leader Abu Bakr al-Baghdadi, as leader of the Islamic State, was now caliph of the Muslim world - a medieval title last widely recognised in the Ottoman sultan deposed 90 years ago after World War One.

Alaa Al-Marjani/Reuters

The Iraqi Special Operations Forces prepare for patrol in Jurf al-Sakhar, south of Baghdad. Iraqi troops battled to dislodge the rebel group Islamic State of Iraq and the Levant (Isis) from the city of Tikrit on Monday, after its leader was declared caliph of a new Islamic state in lands seized this month across of Iraq and Syria

A civilian wearing a mask holds a Tunisian flag in Sidi Bouzid, central Tunisia, Tuesday, Dec. 17, 2013 to mark the third anniversary of the Tunisian uprising. Several political groups gather at the square where Mohamed Bouazizi's self-immolation on Dec. 17, 2010 triggered mass protests against social marginalisation and government corruption in Tunisia.

Aimen Zine/AP

A civilian wearing a mask holds a Tunisian flag in Sidi Bouzid, central Tunisia, to mark the third anniversary of the Tunisian uprising. Several political groups gather at the square where Mohamed Bouazizi’s self-immolation in December 2010 triggered mass protests against social marginalisation and government corruption

A Nepalese Hindu devotee dresses as a deity as he prepares to participate in festivities at the Shikali Temple during celebrations for the Shikali Jatra festival in the village of Khokana, on the outskirts of Kathmandu on October 10, 2013.  Local villagers, who normally do not celebrate the country's most famous festival of Dashain, celebrate the Shikali Jatra each year.

Prakash Mathema/AFP

A Nepalese Hindu devotee, dressed as a deity, prepares to participate in festivities at the Shikali Temple during celebrations for the Shikali Jatra festival in the village of Khokana, on the outskirts of Kathmandu, on Thursday

A demonstrator marches during a teachers protest demanding better working conditions and against police beating, on Monday night in Rio de Janeiro.

Christophe Simon/AFP

A demonstrator marches during a teachers protest demanding better working conditions and against police beating, late on Monday night in Rio de Janeiro.

A teacher helps her student put on a face mask due to the haze in Putrajaya

Bazuki Muhammad/Reuters

A teacher helps her student put on a face mask at a school in Putrajaya, outside Kuala Lumpur, on Wednesday. The Malaysian capital remains shrouded in haze, as the environmental crisis continues after a week of thick hazardous smog covered the country and its neighbour Singapore

A protestor wearing a mask with the colours of the Kenyan flag participates in a demonstration against lawmakers' salary demands outside the parliament buildings in the capital Nairobi, May 14, 2013. Kenyan police in riot gear fired teargas and water cannons on Tuesday to disperse about 200 protesters gathered outside parliament to demonstrate against lawmakers' salary demands. REUTERS/Thomas Mukoya (KENYA - Tags: SOCIETY POLITICS CRIME LAW TPX IMAGES OF THE DAY)

Thomas Mukoya/Reuters

A protestor wearing a mask with the colours of the Kenyan flag participates in a demonstration against lawmakers’ salary demands outside the parliament buildings in the capital Nairobi on Tuesday. Kenyan police in riot gear fired teargas and water cannon in attempts to disperse about 200 protesters.