A stuntman performs while riding a car inside the “Wall of Death” attraction during a fair in Bhaktapur April 20, 2015. (Photo by Navesh Chitrakar/Reuters)

A police officer detains a woman on suspicion of collaborating with the 18th street gang during a "Safe House" operation at the Concepcion neighbourhood in San Salvador, July 2, 2015. Salvadoran police make “Safe House” operations at dangerous neighbourhoods of the capital to prevent murders, according to local media. (Photo by Jose Cabezas/Reuters)

Terashima Takeshi and Akaishi Kazuya of Japan block a shot from Indonesia during day one of the ISTAF Super Series at Palembang Sport Convention Center on February 23, 2012 in Palembang, Sumatra, Indonesia. (Photo by Nicky Loh/Getty Images for UFA Sports)

This is the Legends Russian Series. Legends car exceeds new Porsche 911 power-to-weight ratio – it is 260 hp per ton with the car weight of 500 kg. It’s been designed in the USA by 600 Racing Inc, a subsidiary of Speedway Motorsport, the largest motorsport holding company in America with the annual turnover of $567,000,000. Khimki, Moscow region. February 11, 2012. (Photo by Alexey Petrov)

“A series of ads, developed as a creative idea for UN Women by Memac Ogilvy & Mather Dubai, uses genuine Google searches to reveal the widespread prevalence of sexism and discrimination against women. Based on searches dated 9 March, 2013 the ads expose negative sentiments ranging from stereotyping as well as outright denial of women’s rights”. – UN Women. (Photo by Ogilvy & Mather, Dubai, UAE/UN Women)

Street fighting in Berlin between Government troops and Spartacists, during the Spartacist uprising which followed Germany's defeat in World War I. (Photo by Keystone/Getty Images). 1919

In this September 10, 1977, file photo, from left, Hua Guofeng, Chinese Communist Party (CCP) chairman and Mao Zedong's immediate successor; Ye Jianying, CCP vice chairman and future ceremonial head of state; Deng Xiaoping, no formal titles at the time but soon to emerge as paramount leader during the reform era; Li Xiannian, CCP vice chairman and future president; Wang Dongxing, head of the leadership bodyguard unit who helped topple the Gang of Four, view the body of later Chinese leader Mao Zedong in Beijing. (Photo via AP Photo)