AVE6327415: United States, 1950s: Animation of two cars at night with lights on full and low beam / Bridgeman Images

AVE6327441: 1910s: Woodrow Wilson tips hat at platform with government officials / Bridgeman Images

AVE6327430: 1900s: Freighters on sea / Bridgeman Images

AVE6327447: United States, 1950s: fonts for printing press / Bridgeman Images

AVE6327469: United States, 1950s: man takes notes to boss in office / Bridgeman Images

AVE6327471: 1950s: People exit stairway of building / Bridgeman Images

AVE6327474: 1950s: Assistant writes memo, man sits at desk, dictates / Bridgeman Images

AVE6327480: United States, 1950s: newspaper on printing press machine / Bridgeman Images

AVE6327495: 1950s: Hands fold up bill of legislation / Bridgeman Images

AVE6327501: United States, 1950s: man carves individual letters for printing / Bridgeman Images

AVE6327504: United States, 1950s: boys working in printing press with machines / Bridgeman Images

AVE6327537: Puerto Rico, 1960s: Central plaza in town / Bridgeman Images

AVE6327540: United States, 1970s: patient smiles at doctor / Bridgeman Images

AVE6327552: Puerto Rico, 1960s: Man loads oxen-led cart with sugarcane / Bridgeman Images

AVE6327561: Puerto Rico, 1960s: Large dam at hydroelectric plant / Bridgeman Images

AVE6327560: United States, 1970s: keep door closed sign inside mine / Bridgeman Images

AVE6327612: United States, 1970s: man attaches pipe to ceiling of mine / Bridgeman Images

AVE6327575: United States, 1970s: miner inspects ventilation shaft in mine / Bridgeman Images

AVE6327636: Germany, 1940s: A rocket successfully launches and opens fire in a town / Bridgeman Images

AVE6327617: United States, 1930s: A dog prepares to go to space with different tests / Bridgeman Images

AVE6327678: United States, 1950s: Cloud forming after a nuclear explosion / Bridgeman Images

AVE6327693: Russia, 1950s: Konstantin Tsiolkovsky writes literature regarding the potential future of space exploration with the invention of rockets / Bridgeman Images

AVE6327647: United States, 1950s: Animation of satellite, dog superimposed in satellite / Bridgeman Images

AVE6327711: United States, 1950s: Spectators wait eagerly as those in the control room prepare to launch an event / Bridgeman Images

AVE6327671: United States, 1950s: Military officials inspect rockets / Bridgeman Images

AVE6327750: 1970s: Teacher speaks to class / Bridgeman Images

AVE6327704: United States, 1950s: Reporters and newsmen arrive at a US base to witness the launching of a rocket / Bridgeman Images

AVE6327774: United States, 1990s: Slow motion of drop on pond / Bridgeman Images

AVE6327710: United States, 1950s: People in a metropolitan area do their activities of daily living / Bridgeman Images

AVE6327801: 1950s: Drawing of two people / Bridgeman Images

AVE6327716: 1970s: Bus picks up children at bus stop / Bridgeman Images

AVE6327813: America, c.1990s: Astronaut, attached to a robotic arm, works on the exterior of the space shuttle Endeavour in orbit / Bridgeman Images

AVE6327532: United States, 1970s: miners at shaft lift / Bridgeman Images

AVE6327541: Puerto Rico, 1960s: Boy and girl shake hands / Bridgeman Images

AVE6327770: America, c.1990s: Long shot two astronauts on STS-49 mission who work together to install capture bar on satellite / Bridgeman Images

AVE6327565: Puerto Rico, 1960s: Men walk down steps of government building lined with columns / Bridgeman Images