AVE6326927: United States, 1960s: man speaks to crowd / Bridgeman Images

AVE6326946: United States, 1960s: worker in factory / Bridgeman Images

AVE6326949: United States, 1950s: television picture tube on table / Bridgeman Images

AVE6326994: Egypt, 1970s: A group of people riding camels stares at a pyramid in Egypt / Bridgeman Images

AVE6326793: UNITED STATES 1970s – Burger is prepared, accentuating members of the different food groups. / Bridgeman Images

AVE6326796: UNITED STATES 1970s – Many fast food restaurants in the United States offering burgers. / Bridgeman Images

AVE6326808: United States, 1960s: Finished papers are cut into halves to produce two copies of paper. / Bridgeman Images

AVE6326814: United States, 1960s: Writer and photographer arrive at airport to witness a young elephant being unloaded from a plane. / Bridgeman Images

AVE6326860: 1930s: Several children raise their hands in classroom / Bridgeman Images

AVE6326863: 1950s: Woman sitting in backyard / Bridgeman Images

AVE6326881: 1950s: Two men speak / Bridgeman Images

AVE6326899: 1950s: People secure boats in marina / Bridgeman Images

AVE6326905: 1930s: Students sit and look at professor who writes on a board / Bridgeman Images

AVE6326911: United States, 1960s: students protest by college / Bridgeman Images

AVE6326914: United States, 1960s: students walk during strike at college / Bridgeman Images

AVE6326917: United States, 1960s: students walk along corridor / Bridgeman Images

AVE6327004: Egypt, 1970s: Pharaoh statues stand outside to guard a burial ground in Egypt / Bridgeman Images

AVE6324343: United States: 1950s: men work at RADEF desk. / Bridgeman Images

AVE6324346: United States: 1950s: Men talk at office desk. / Bridgeman Images

AVE6324400: 1950s: Cars and trucks driving on the highway / Bridgeman Images

AVE6324528: Scientist Uses Pipette in Lab / Bridgeman Images

AVE6324579: Man Washes Self Down After Spilling Pesticides / Bridgeman Images

AVE6324585: Hands Picking Cherries from a Tree / Bridgeman Images

AVE6324588: 1910s: Girl scrubs wooden floor, then runs outside excitedly / Bridgeman Images

AVE6324267: 1970s: UNITED STATES: hand on keys on till. / Bridgeman Images

AVE6324285: 1970s: UNITED STATES: girl and boy in shop. / Bridgeman Images

AVE6324330: United States: 1950s: Radioactive symbol on brick building. / Bridgeman Images

AVE6324345: United States: 1950s: hand writes down data from weather bureau. / Bridgeman Images

AVE6324351: United States: 1950s: man at desk makes call. / Bridgeman Images

AVE6324375: United States: 1950s: Hand writes pencil notes on logbook. / Bridgeman Images

AVE6324399: 1950s: A car pulls out of the driveway / Bridgeman Images

AVE6324305: 1970s: UNITED STATES: side profile of lady's face. / Bridgeman Images

AVE6324536: White Rats Being Injected in Lab / Bridgeman Images

AVE6324520: Helicopter Spraying Pesticides on Trees and Bushes / Bridgeman Images

AVE6324529: Man Undertakes Research with Test Tubes in Laboratory / Bridgeman Images

AVE6324602: 1910s: Adult woman and young girl walk down lineup of girls while questioning them / Bridgeman Images