Surfer Arlen Macpherson sits on his board, which has an electronic shark repellent device installed, at Sydney's Bondi Beach in Australia, August 18, 2015. A spate of shark attacks in Australia has left some of world's top surfing beaches deserted and many people having second thoughts about taking a swim as the summer approaches. Macpherson paid A$390 for a device embedded in his surf board to repel sharks by emitting an electronic force field that overpowers its sensing organs. (Photo by David Gray/Reuters)

Sun Rongchun, 57, exercises with an improvised cervical traction device attached to a high bar at a sports complex in Shenyang, Liaoning province, China on April 9, 2019. (Photo by Sheng Li/Reuters)

A transparent van is displayed by a vendor for safety devices at the IAA Auto Show in Frankfurt, Germany, Tuesday, September 10, 2019. (Photo by Michael Probst/AP Photo)

A motorcycle fitted out to look like a giant telephone in an effort by the GPO to bring home to the public the importance of the phone. The dial on the wheel bears the slogan, “The World at Your Finger Tips”. (Photo by Topical Press Agency/Getty Images). 20th June 1932

A machine assembles powder, cartridges and bullets tips together to make 300 AAC Blackouts at Barnes Bullets in Mona, Utah, January 6, 2015. (Photo by George Frey/Reuters)

A hint of Spring Fever is evidenced by this passerby tipping his hat to a store fixture mannequin on a State St. sidewalk in downtown Chicago on March 23, 1978. The mannequin was awaiting pickup to be transported. (Photo by AP Photo)

On the Internet appeared the video, on which shows, according to the author of the video, as in the photos, which were taken by U.S. space probe MESSENGER (MErcury Surface, Space ENvironment, GEochemistry and Ranging), American automatic interplanetary station (AWS) for the study of Mercury, on the surface of Mercury has been found an unusual object... (Photo by NASA)

Daniel Filip, Tech Lead Manager for Google Maps, carries the Trekker, a 15-camera device, while mapping the Inca citadel of Machu Picchu for Google Street View in Cuzco, Peru, August 11, 2015. (Photo by Pilar Olivares/Reuters)