AVE6322233: USA, 1950s: Cages containing control and experimental white lab rats / Bridgeman Images

AVE6322245: United States, 1940s: Boys Collect Corn in Sacks / Bridgeman Images

AVE6322331: 1950s: School campus / Bridgeman Images

AVE6322337: 1950s: Men and women sit and speak / Bridgeman Images

AVE6327472: United States, 1950s: man polishes machine / Bridgeman Images

AVE6327517: United States, 1950s: animation of printing press machine / Bridgeman Images

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

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

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

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

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

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

AVE6327653: United States, 1950s: Views of rocket launch crew in control booth / Bridgeman Images

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

AVE6327701: United States, 1950s: Dr. Goddard and his early rocket experiments / Bridgeman Images

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

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

AVE6327713: 1970s: Children walk along side of road / Bridgeman Images

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

AVE6327719: 1970s: Students grab hand rail and climb onto bus / Bridgeman Images

AVE6327734: United States, 1950s: The satellite Explorer I is prepared in a facility / Bridgeman Images

AVE6327746: United States, 1950s: Rocket on launch pad falling over / Bridgeman Images

AVE6327764: United States, 1990s: Panning shot of city skyline / Bridgeman Images

AVE6327767: America, c.1990s:Medium shot of astronaut on STS-49 mission providing telecom instructions on how to install capture bar on satellite to a second astronaut who works to install the bar / 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

AVE6327779: United States, 1990s: Close up antenna, zoom out / Bridgeman Images

AVE6327818: 1950s: Pile of books gets smaller as some disappear / Bridgeman Images

AVE6327824: 1950s: Young woman speaks in front of chalkboard / Bridgeman Images

AVE6327830: 1950s: Young man in college classroom raises hand / Bridgeman Images

AVE6327860: America, c.1990s: Robotic arm controllers maneuver astronaut, on STS-49 mission, toward a rotating satellite / Bridgeman Images

AVE6327863: 1950s: Young man holds book in college classroom / Bridgeman Images

AVE6327872: 1950s: Young woman in audience gestures and speaks / Bridgeman Images

AVE6327878: 1960s: Woman places child in crib / Bridgeman Images