Four men ride a motorbike past sacrificial animals displayed for sale ahead of the Eid al-Adha festival at a livestock market in Sana'a, Yemen, 08 August 2019. Eid al-Adha is the holiest of the two Muslims holidays celebrated each year; it marks the yearly Muslim pilgrimage (Hajj) to visit Mecca, Islam's holiest place. Muslims slaughter a sacrificial animal and split the meat into three parts: one for family, one for friends and relatives, and one for the poor and needy. (Photo by Yahya Arhab/EPA/EFE)

A demonstrator is detained by police officers during a protest in Hong Kong, China on August 31, 2019. Hong Kong police fired tear gas and water cannons and pro-democracy protesters threw petrol bombs in the latest in a series of chaotic clashes that have plunged the Chinese-ruled city into its worst political crisis in decades. (Photo by Kai Pfaffenbach/Reuters)

Alien-themed decorations are seen at the Alien Research Center in Hiko, September 19, 2019. Scores of UFO enthusiasts converged on rural Nevada for a pilgrimage of sorts to the U.S. installation known as Area 51, long rumored to house government secrets about alien life, as law enforcement officials beefed up security around the military base. (Photo by Jim Urquhart/Reuters)

In a photo taken on September 11, 2019, North Korean students pose for photos in Chonji lake, or “Heaven lake”, as they visit the crater of Mount Paektu, near Samjiyon. Mount Paektu has long been considered the spiritual birthplace of the Korean nation and is a place of pilgrimage for tens of thousands of North Koreans every year, who are trained from birth to revere their leaders. (Photo by Ed Jones/AFP Photo)

Demonstrators clash with riot police during a protest against President Sebastian Piñera on October 21, 2019 in Santiago, Chile. President Sebastian Piñera suspended the 3.5% subway fare hike and declared the state of emergency for the first time since the return of democracy in 1990. Protests had begun on Friday and developed into looting and arson, generating chaos in Santiago, Valparaiso and a dozen other cities resulting in at least 8 dead. (Photo by Marcelo Hernandez/Getty Images)

A member of the riot police gets ready to repel the attacks of protesters during a protest against President Sebastian Piñera during the seventh day of protests against President Sebastian Piñera on October 24, 2019 in Santiago, Chile. Although President Sebastian Piñera announced measures to improve equality, unions called for a national strike and demonstrations continue as casualties are now at least 18. Demands behind the protest include issues like health care, pension system, privatization of water, public transport, education, social mobility and corruption. (Photo by Marcelo Hernandez/Getty Images)

Members of the Turkana community work unblocking an irrigation canal to provide water to their sorghum crops in an arid dry area in Nanyee, near Lodwar, Turkana County, Kenya, on October 1, 2019. Turkana is a vast, dry area in the north-west of Kenya that is on the frontline of climate change. With regular searing temperatures the Turkana people are suffering from recurring and prolonged droughts. (Photo by Luis Tato/AFP Photo)

A woman cries while being escorted by police officers during an anti-government protest in Santiago, Chile, 07 November 2019. A proposed increase in the price of metro fares sparked a series of anti-government protests that have left at least 20 people dead. The protestors are demanding improvements in the quality of healthcare, education and general distribution of wealth in Chile. (Photo by Orlando Barría/EPA/EFE)