AVE6322161: 1940s: Men bundle and hang large fishing nets on dock / Bridgeman Images

AVE6322162: 1980s: A hand touches the nose of a model airplane / Bridgeman Images

AVE6322167: 1940s: Men lean on railing and talk / Bridgeman Images

AVE6322168: 1980s: Machine writes on graph paper / Bridgeman Images

AVE6322177: 1980s: A 1960s U.S Army aircraft demonstrates a vertical takeoff / Bridgeman Images

AVE6322182: USA, 1950s: Pig eating corn cobs in a field / Bridgeman Images

AVE6322190: 1980s: A man operates the controls of an airplane / Bridgeman Images

AVE6322198: USA, 1950s: Diagram showing flow of molecules inside an artificial respiration machine / Bridgeman Images

AVE6322201: 1980s: Computer model of an airplane spinning / Bridgeman Images

AVE6322206: 1980s: Plane emits a condensation trail / Bridgeman Images

AVE6322211: USA, 1950s: Chart showing the energy metabolism and respiration of a person on a machine / Bridgeman Images

AVE6322220: USA, 1950s: Close up animation of molecules leaving a cell and entering blood stream / Bridgeman Images

AVE6322223: USA, 1950s: Close up animation of molecules leaving a cell and entering blood stream / Bridgeman Images

AVE6322230: USA, 1950s: Man throws crops on to horse and cart in field / Bridgeman Images

AVE6322231: 1980s: A child looks up / Bridgeman Images

AVE6322232: 1980s: People look up and point at the aircraft in the Smithsonian National Air and Space Museum / Bridgeman Images

AVE6322237: USA, 1950s: animation of effects of sensory perception of food on the stomach and brain / Bridgeman Images

AVE6322252: United States, 1940s: Furrows on Pasture Land / Bridgeman Images

AVE6322257: United States, 1940s: Conservation Farming Practices on Farm Land / Bridgeman Images

AVE6322260: United States, 1940s: Farming Soy Beans and Corn / Bridgeman Images

AVE6322263: United States, 1940s: Apples on a Conveyor Belt / Bridgeman Images

AVE6322268: United States, 1940s: Soldiers Eating Food / Bridgeman Images

AVE6322271: United States, 1940s: Military Planes Fly Over Farmer's Fields / Bridgeman Images

AVE6322303: 1950s: Cotton field / Bridgeman Images

AVE6324225: United States 1950s: A lab technician uses a radiation testing machine to read the emissions from a stack of gallium blocks / Bridgeman Images

AVE6324232: United States 1950s: Long shot of a five-lane highway on which numerous cars drive / Bridgeman Images

AVE6324233: United States 1950s: Montage: Two researchers pour small fish into a net / Bridgeman Images

AVE6324234: United States 1950s: A children's ward at a research hospital / Bridgeman Images

AVE6324238: United States 1950s: A patient in a research hospital sets down a glass from which he drank a radioactive iodine solution / Bridgeman Images

AVE6324239: United States 1950s: An instrument is used to observe the thyroid of a patient / Bridgeman Images

AVE6324246: United States 1950s: Scientists build a green house inside a building / Bridgeman Images

AVE6324255: United States 1950s: A man climbs up a telephone pole as manufacturing plants emit smoke / Bridgeman Images

AVE6327429: United States, 1950s: hand turns page of book / Bridgeman Images

AVE6327433: 1910s: Woodrow Wilson signs papers / Bridgeman Images

AVE6327443: United States, 1950s: man types words into printing machine / Bridgeman Images

AVE6327444: 1930s: Franklin D. Roosevelt is inaugurated before crowd / Bridgeman Images