Libyan forces allied with the U.N.-backed government fire weapons during a battle with IS fighters in Sirte, Libya, July 21, 2016. (Photo by Goran Tomasevic/Reuters)

In this June 6, 1966 file photo, civil rights activist James Meredith pulls himself across Highway 51 after being shot in Hernando, Miss. Meredith, who defied segregation to enroll at the University of Mississippi in 1962, completed the march from Memphis, Tenn., to Jackson, Miss., after being treated for his wounds. (Photo by Jack Thornell/AP Photo)

Local residents fight to collect free drinking water from municipal corporation tanker on a hot summer day on the outskirts of Ahmedabad, India June 1, 2016. (Photo by Amit Dave/Reuters)

Construction cranes stand on the Unstrut Valley high-speed railway bridge on March 19, 2012 near Karsdorf, Germany. The Unstrut bridge, which is 2,668m long (about 1.6 miles), is among 38 bridges and 26 tunnels German state rail carrier Deutsche Bahn is building along a new ICE high-speed railroad connection between Nuremberg, Erfurt, Halle, Leipzig and Berlin in a multi-billion Euro project across eastern Germany called the German Unity Transportation Project (Verkehrsprojekt der Deutschen Einheit). (Photo by Sean Gallup/Getty Images)

Workmen use a crane to winch a large stone head, created by British sculptor Emily Young, into Berkeley Square on February 2, 2012 in London, England. (Photo by Oli Scarff/Getty Images)

Τhe hovering car without wheels, also called the hovercar, is a constant fixture in science fiction films, video games and comic books, and a long-standing dream for car lovers and technology fans alike. This dream is also shared by French photographer Renaud Marion, who creates images depicting hovering cars in everyday urban settings. In his ongoing photographic project titled ‘‘Air Drive’’, Marion combines retro car designs with futuristic technology, a project driven by his childhood visions of how the world was going to look like in the future. (Photo by Renaud Marion)

Young girls attend a training session in MGFSO Olympic reserve school in Moscow on May 30, 2016. (Photo by Kirill Kudryavtsev/AFP Photo)

A general view of atmosphere at the annual VOLT Festival in Sopron, 208 kms west of Budapest, Hungary on June 30, 2017. (Photo by Sandor Csudai/Rockstar Photographers)