People in Kathmandu joke that the face mask has now become part of the national dress – an indispensable accessory in an effort to protect themselves from the dust. Nepal has the worst air quality in the world, according to the Environmental Performance Index. (Photo by Pete Pattisson/The Guardian)

White House Press Secretary James Brady and District of Columbia police officer Thomas Delahanty lie wounded on the ground after John Hinckley Jr. fired six shots at President Reagan outside the Washington Hilton Hotel in Washington, DC, on March 30, 1981. (Photo by Courtesy Reagan Library via Reuters)

Julia Wheeler, 31, from Perth, Western Australia, has been a hands reach away from pilot whales, Bull sharks, manta rays and more during her time diving without any breathing equipment. Here real life mermaid Julia is diving with manta rays in Bali and looks incredible swimming among them while holding her breath for four and a half minute. (Photo by Julia Wheeler/Caters News Agency)

A tow car for the children's “Grand Prix” races which take place in a parking lot in Livonia, Michigan a suburb of Detroit, circa 1955. (Photo by Three Lions/Getty Images)

“Stephen Gough (born c. 1959), also known as Steve Gough and the Naked Rambler, is an activist, and a British former Royal Marine. In 2003-2004, he walked the length of Great Britain naked. He did it again in 2005-2006, but was arrested in England and in Scotland. He subsequently spent six years in prison, having been repeatedly rearrested for public nudity within a short period, each time he was released. He has spent most of his sentences in Saughton and Perth prisons, in Scotland”. – Wikipedia

Photo: Stephen Gough the naked rambler makes his way south through Peebles in the Scottish Borders, following his release from Saughton Prison yesterday after serving his latest sentence on October 6, 2012 in Peebles, Scotland. (Photo by Jeff J. Mitchell)

“A Brazilian hotel was evacuated in the capital, Brasilia, on Monday after a man took hostage an employee who was held for hours before he was safely released to police. Firefighters and police cordoned off the area and about 300 guests and other employees left the hotel – some reportedly told to leave by the man who took the employee hostage”. – Associated Press. (Photo by Evaristo Sa/AFP Photo)

Coffins are lined up near the wreckage of the bus, on July 29, 2013. (Photo by Salvatore Laporta/Associated Press)

In this photo taken June 3, 2009, a female North Korean soldier looks out from behind a barbed-wire fence around a camp on the North Korean river banks across from Hekou, northeastern China's Liaoning province. North Korea's top court has convicted two U.S. journalists, and sentenced them to 12 years in labor prison, the country's state news agency reported Monday. (Photo by Ng Han Guan/AP Photo)