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

AVE6322303: 1950s: Cotton field / Bridgeman Images

AVE6322312: United States, 1960s: Ladies in check out line / Bridgeman Images

AVE6322315: 1950s: Pencil points at list / Bridgeman Images

AVE6322322: United States, 1960s: close up as lady turns key at till / Bridgeman Images

AVE6322329: 1950s: People walk on school campus / Bridgeman Images

AVE6322332: United States, 1960s: Produce manager smiles / Bridgeman Images

AVE6322344: United States, 1960s: lady takes items from trolley / Bridgeman Images

AVE6322354: United States, 1960s: lady looks at check out girl / Bridgeman Images

AVE6322355: 1950s: Police officer writes on chalkboard and speaks / Bridgeman Images

AVE6322358: United States, 1960s: Lady picks up groceries / Bridgeman Images

AVE6322360: United States, 1960s: Supermarket assistant tells customer the cost of groceries / Bridgeman Images

AVE6322364: United States, 1960s: lady counts out change into customer's hand / Bridgeman Images

AVE6322365: 1950s: Man drives tractor in field / Bridgeman Images

AVE6322367: United States, 1960s: close up of lady's face / Bridgeman Images

AVE6322370: 1950s: Traffic / Bridgeman Images

AVE6322371: 1920s: pies hits man in the face / Bridgeman Images

AVE6322374: 1950s: Construction site / Bridgeman Images

AVE6322378: 1920s: man rushes from door, trips and falls face first into dirt road / Bridgeman Images

AVE6322423: United States, 1970s: Businessman walks in front of graffitied wall / Bridgeman Images

AVE6322434: United States, 1970s: Large building with columns has graffiti at base, young man climbs up to billboard and begins spray painting it, artistic shot of him spray painting the camera lens / Bridgeman Images

AVE6322439: United States, 1970s: Wall being spray painted with graffiti, student writes on his desk with a marker / Bridgeman Images

AVE6322443: United States, 1970s: A diverse group of students paint on canvases at desks and talk with the instructor and each other, young man scrubs at camera / Bridgeman Images

AVE6322445: United States, 1970s: Young man gives up on trying to clean off wall graffiti and throws brush into bucket, business people meet in an office and look at model bus, graffitied wall and bus / Bridgeman Images

AVE6322460: United States, 1970s: Animation of some graffitied slogans / Bridgeman Images

AVE6322475: United States, 1950s: Animation of sound waves hitting listener / Bridgeman Images

AVE6322482: United States, 1980s:computer model shows impacts of gravity on human brain / Bridgeman Images

AVE6322493: United States, 1980s:Workers look at computer / Bridgeman Images

AVE6322496: United States, 1980s:women work in lab / Bridgeman Images

AVE6322497: United States, 1950s: Animation of sound waves hitting ear, entering brain / Bridgeman Images

AVE6322499: United States, 1980s:lady counts bacteria growth in gel / Bridgeman Images

AVE6322501: United States, 1950s: Boys singing in choir / Bridgeman Images

AVE6322506: United States, 1980s:scientists prepare experiments for astronauts in space / Bridgeman Images

AVE6320327: Europe, 1940s: citizens sleep on Leicester Square underground station platform during air raid / Bridgeman Images

AVE6320339: Europe, 1940s: pilots in plane at night / Bridgeman Images

AVE6320341: Unites States, 1970s: round circle on dark background / Bridgeman Images