A fellow officer comes to the aid of injured patrolman C.V. Satt, who was pelted with rocks and beer bottles during a clash between police and relief demonstrators in Denver September 23, 1935. (Photo by Henry G. Eisenhand/AP Photo)

Veterinarian William Guerra Neto (2nd R) and an assistant take measurements of two Amazonian manatees who are being rehabilitated after sustaining injuries from hunting and fishing nets at the Center of Amazonian Manatees at Amana Lake in Maraa, Amazonas state, Brazil, September 21, 2015. (Photo by Bruno Kelly/Reuters)

“These are the mind-blowing artworks of one professor who has dedicated his professional life to studying and generating a series of dizzying optical illusions. Professor Akiyoshi Kitaoka, from Ritsumseikan University, in Kyoto, Japan, has spent more than a decade creating his collecting of stomach-churning works. His designs have been used by the likes of Lady Gaga, who ran the Kitaokas work, entitled Gangaze, as the CD cover for her album Art Pop, in 2013”. – Caters News. (Photo by Akiyoshi Kitaoka/Caters News)

Photographer uses pinhole camera in his mouth to capture photos around the world. The 52-year-old Justin Quinnell, who lives in Bristol, is known for his eye-catching photographs taken from a unique angle – right inside his mouth. (Photo by Justin Quinnell/Rex Features)

Young Christian Lebanese women, who are members of Kataeb Phalangist party, show their skill in handling arms while they train in a village between Christian-controlled eastern port of Jounieh and the Christian village of Zahle in the west Lebanon on September 9, 1976. The Lebanese civil war erupted in April 1975. (Photo by Erich Stering/AFP Photo)

Friends of Li Guojun drive a homemade tank-shaped vehicle in Kangping county, China. Li, a farmer who is a fan of tanks, spent six months with help from his friends to construct the almost 20-foot vehicle which weighs 2.5 tons. (Photo by Sheng Li/Reuters)

Unidentified relatives and friends of passengers who were flying in an EgyptAir plane that vanished from radar en route from Paris to Cairo react as they wait outside the Egyptair in-flight service building where relatives are being held at Cairo International Airport, Egypt May 19, 2016. (Photo by Amr Abdallah Dalsh/Reuters)

Malawian Saw-wa, 33, (L) and Yupin Saw-wa, 28 who lost their daughters, cry near a burnt building at the Pitakkiat Wittaya School in the northern province of Chiang Rai, Thailand, May 23, 2016. (Photo by Athit Perawongmetha/Reuters)