AVE8928454: 1960s: Organisms flitting about and pushing each other around. / Bridgeman Images

AVE8928456: 1960s: Snowcapped mountains tower above snowy valley. / Bridgeman Images

AVE8928465: 1960s: Boy and girl talk on sidewalk, boy holds Valentines card. They go separate ways. / Bridgeman Images

AVE8928469: 1960s: Several birds on grass field. / Bridgeman Images

AVE8928490: 1960s: Man points to campus in valley and talks to students. / Bridgeman Images

AVE8928532: 1960s: Clouds in sky. / Bridgeman Images

AVE8928542: 1960s: Clouds in sky. / Bridgeman Images

AVE8928544: 1960s: Buoy bobs in the water. / Bridgeman Images

AVE8928545: 1960s: Hands place butter, milk and egg carton on kitchen table. Hand places carton of cream on kitchen table. / Bridgeman Images

AVE8928546: 1960s: Boy measures board at workbench. Boy builds birdhouse on workbench. / Bridgeman Images

AVE8928550: 1960s: Man reads blueprints and looks at skyscraper under construction. / Bridgeman Images

AVE8928554: 1960s: Pine forest sits in valley below snow-topped mountains. / Bridgeman Images

AVE8928559: 1960s: Woman cracks egg in bowl of flour and stirs it with spoon. Woman pours milk into bowl and stirs it with electric hand mixer. Woman pours glass of milk at kitchen table. / Bridgeman Images

AVE8928561: 1960s: Butterflies in garden. / Bridgeman Images

AVE8928562: 1960s: Needle moves on car speedometer and steering wheel turns as man drives car. / Bridgeman Images

AVE8928563: 1960s: Butterflies in garden. / Bridgeman Images

AVE8928572: 1960s: Caterpillar walks along branch. / Bridgeman Images

AVE8928573: 1960s: Collapsed buildings, roadways and rubble sit in city. / Bridgeman Images

AVE8928574: 1960s: Collapsed buildings, roadways and rubble sit in city. / Bridgeman Images

AVE8928575: 1960s: White blooms in meadow. / Bridgeman Images

AVE8928577: 1960s: Dump truck dumps pile of rocks and dirt from back. Bulldozer pushes pile of dirt and rocks near trees. / Bridgeman Images

AVE8928592: 1960s: Leaves fall in Autumn forest. Silo and barn stands near corn field on farm. / Bridgeman Images

AVE8928593: 1960s: Caterpillar inside chrysalis. / Bridgeman Images

AVE8928601: 1960s: Bird in cage pecks at bowl of feed. / Bridgeman Images

AVE8928602: 1960s: Cat sniffs at base of fence, then walks away. / Bridgeman Images

AVE8928603: 1960s: Cat stands and stretches. / Bridgeman Images

AVE8928604: 1960s: Viking long boat sails across ocean. Model of Viking ship sails on water. / Bridgeman Images

AVE8928605: 1960s: Cat plays with yo-yo, then runs away. / Bridgeman Images

AVE8928609: 1960s: Viking long boat sails across ocean. Model of Viking ship sails on water. / Bridgeman Images

AVE8928614: 1960s: Men in robes and togas kneel on ground. Man draws lines in sand and talks to man with fruit bowl. / Bridgeman Images

AVE8928327: 1960s: Looking out open window of house. Curtains inside house blow from wind, trees outside sway. / Bridgeman Images

AVE8928335: 1960s: Radiological x-ray of barium swallow. / Bridgeman Images

AVE8928338: 1960s: Garbage landfill. / Bridgeman Images

AVE8928339: 1960s: Weather vane stands on roof of home. / Bridgeman Images

AVE8928343: 1960s: Boy and girl look at Valentine's Day card and talk on sidewalk. Girl waves goodbye and children walk away on sidewalk. / Bridgeman Images

AVE8928346: 1960s: Radiological x-ray of barium swallow. / Bridgeman Images