British Royal Edward, Prince of Wales, and French politician Gaston Doumergue, President of France, during the opening ceremony of the 1924 Summer Olympics, held at the Stade Olympique de Colombes, in the Colombes suburb of Paris, France, 5th July 1924. (Photo by Central Press/Hulton Archive/Getty Images)





Helen Wills of the USA in play during the doubles match between Wills and Hazel Wightman and British duo Phyllis Covell and Kathleen McKane. Wills and Wightman won the gold, 1924. (Photo by PA Images via Reuters Connect)





Teenager Mary Ann Vecchio kneels over the body of Kent State University student Jeffrey Miller (1950 - 1970) who had been shot during an anti-war demonstration on the university campus, Kent, Ohio, May 4, 1970. The protests, initially over the US invasion of Cambodia, resulted in the deaths of four protesters, including Miller, and the injuries of nine others after the National Guard opened fire on students. (Photo by Howard Ruffner/Getty Images)





The boxer Muhammad Ali puts on a show at the New York State Athletic Commission's office in New York City on January 23, 1974, as he tries to force his way into the room where his opponent, Joe Frazier, was getting his pre-fight physical. (Photo by Marty Lederhandler/AP Photo)





Kent State University student Joe Cullum (center, with beard) and others kneel on the grass beside wounded fellow student John Clearly after the latter had been shot when the Ohio National Guard opened fire on antiwar protestors, Kent, Ohio, May 4, 1970. Four protestors were shot and killed (and nine injured) during the incident. A cropped version of this image appeared in the cover of the May 15, 1970, issue of Life magazine. (Photo by Howard Ruffner/Getty Images)





This photo shows the radio station at the Colombes Stadium, by means of which spectators were able to follow the progress of the marathon race. Scouts along the route reported to this station by telephone, and a series of amplifiers carried the information to the thousands in the stands. 1924. (Photo by Bettmann Archive)





Despite sub-freezing temperatures and rain, a crowd waits in line outside the Paramount Theater in New York City February 4, 1974 for a showing of "The Exorcist." Theater operators in the 28 cities where the picture is showing report full houses, long lines and extra showings. (Photo by Ron Frehm/AP Photo)





South Vietnamese Rangers rush children to a helicopter for evacuation from the Duc Hue base camp, about 35 miles northwest of Saigon, on April 5, 1974. The camp had been under enemy artillery attack for more than a week. (Photo by Associated Press)





On Blanket Hill, Kent State University students, several with hands over their mouths, stare in the aftermath of the Ohio National Guard having opened fire on their antiwar demonstration, Kent, Ohio, May 4, 1970. Four protestors were eventually shot and killed (and nine injured) when troops began to fire their weapons into the crowd. (Photo by Howard Ruffner/Getty Images)





People dance in the streets of Harvard Square in Cambridge, August 9, 1974, following the resignation of Pres. Nixon on television. More than a thousand persons participated in the demonstration. (Photo by Peter Bregg/AP Photo)





circa 1939: Full-length view of members of the German light machine-gun Cyclist Corps wearing gas masks while standing next to their bicycles in a lineup in Austria during World War II. A machine gun is attached to one of the bicycles (2nd from R). (Photo by Hulton Archive/Getty Images)





View, from behind, as Ohio National Guardsmen in gas masks and with rifles as they prepare to advance up Blanket Hill, through clouds of teargas, to drive back Kent State University students during an antiwar demonstration on the university's campus, Kent, Ohio, May 4, 1970. Visible at left is Taylor Hill. The protests, initially over the US invasion of Cambodia, resulted in the deaths of four protesters (and the injuries of nine others) after the National Guard opened fire on students. (Photo by Howard Ruffner/Getty Images)





Parents march in support of LGBTQ rights at Gay Pride parade in Greenwich Village, New York City, US, 30th June 1974; (right) is American lawyer Dick Ashworth marching with a sign that reads “I'm Proud of My Gay Son”. He later became one of the founding members of PFLAG (Parents, Families, and Friends of Lesbians and Gays). (Photo by Bettmann via Getty Images)





The Manhattan Bridge, framed by nearby buildings, photographed in Brooklyn in June 1974. (Photo by Danny Lyon/NARA)





Members of the Hitler Youth who are trained to report airstrikes repaining their bicycles. Published by: “Die Sirene”. 1942. (Photo by Herbert Hoffmann/Ullstein Bild via Getty Images)