AVE6322200: USA, 1950s: Man blowing into a test tube of water through a straw / Bridgeman Images

AVE6322209: 1980s: A research helicopter flies / Bridgeman Images

AVE6322227: USA, 1950s: Two vials, one holding normal blood, the other holding anemic blood / Bridgeman Images

AVE6322242: United States, 1940s: Cows Eating Corn on Farm / Bridgeman Images

AVE6322251: United States, 1940s: Terraces in a Field / Bridgeman Images

AVE6322269: United States, 1940s: Bomber Taking Off / Bridgeman Images

AVE6322304: 1950s: Classroom / Bridgeman Images

AVE6322316: United States, 1960s: close up of traffic light at green / Bridgeman Images

AVE6322328: United States, 1960s: lady touches up hair / Bridgeman Images

AVE6322006: Woman Puts Washing Machine On / Bridgeman Images

AVE6322012: Man Turns on Television / Bridgeman Images

AVE6322015: United States, 1950s: man talking on phone, man hangs up phone, man walks away / Bridgeman Images

AVE6322005: Woman Does Family Washing Over a Wash Tub / Bridgeman Images

AVE6322024: United States, 1950s: man picks up telephone, man speaking on telephone / Bridgeman Images

AVE6322011: Doctors Examine Woman's Internal Organs with a Flouroscope / Bridgeman Images

AVE6322056: United States, 1950s: Views of audience at circus / Bridgeman Images

AVE6322036: United States, 1950s: Man in factory adjusts valve / Bridgeman Images

AVE6322057: United States, 1950s: Views of audience at circus / Bridgeman Images

AVE6322165: 1980s: A machine writes data on graph paper / Bridgeman Images

AVE6322174: 1980s: A 1960s U.S Army aircraft is wheeled in to a field / Bridgeman Images

AVE6322189: USA, 1950s: Two glass jars, one containing a lit candle that goes out when oxygen is used up / Bridgeman Images

AVE6322213: USA, 1950s: Cows grazing in field under trees / Bridgeman Images

AVE6322216: 1980s: View from a plane flying in a loop / Bridgeman Images

AVE6322249: United States, 1940s: Farm Buildings Fall Down Due to Lack of Money / Bridgeman Images

AVE6322255: United States, 1940s: Pigs on a Farm / Bridgeman Images

AVE6322258: United States, 1940s: Hay Bales in a Field / Bridgeman Images

AVE6322261: United States, 1940s: Ladies Picking Beans in a Field / Bridgeman Images

AVE6322264: United States, 1940s: Milk Production Line in a Factory / Bridgeman Images

AVE6322205: 1980s: A pilot drives his small aircraft down a runway / Bridgeman Images

AVE6322302: 1950s: Newspapers / Bridgeman Images

AVE6322259: United States, 1940s: Workers Pick Corn in a Field / Bridgeman Images

AVE6322314: 1950s: Woman looks through file cabinets / Bridgeman Images

AVE6322321: 1950s: Men sit and talk at meeting / Bridgeman Images

AVE6322323: United States, 1960s: Lady at check out till prepares register for customers / Bridgeman Images

AVE6322353: United States, 1960s: check out lady gives vouchers and receipts to customer / Bridgeman Images

AVE6322468: United States, 1980s:lady looks down microscope / Bridgeman Images