AVE8928461: 1960s: Child falls in snow, rolls around. / Bridgeman Images

AVE8928464: 1960s: Squirrel runs around on snow. / Bridgeman Images

AVE8928470: 1960s: Snowcapped mountains tower above snowy valley. / Bridgeman Images

AVE8928478: 1960s: Tall plants growing up from the ground. / Bridgeman Images

AVE8928481: 1960s: Fern growing on a tree stump in the stream. / Bridgeman Images

AVE8928496: 1960s: Men with crane unload lumber from cargo ship at dock. Water pours from ballast of cargo ship at dock. / Bridgeman Images

AVE8928501: 1960s: Sun rises over smoggy cityscape. / Bridgeman Images

AVE8928502: 1960s: Waves ripple through body of water. / Bridgeman Images

AVE8928506: 1960s: View of body of water. / Bridgeman Images

AVE8928510: 1960s: Water flows down canal. / Bridgeman Images

AVE8928511: 1960s: Farmland, vegetation, and pooling water. / Bridgeman Images

AVE8928518: 1960s: Model planets and sun sits on display in museum. Model of planets of the solar system sit on display. / Bridgeman Images

AVE8928520: 1960s: Boy draws bucket of water from well. / Bridgeman Images

AVE8928521: 1960s: Model planets and sun sits on display in museum. Model planet Earth sits near sun. / Bridgeman Images

AVE8928523: 1960s: Man studies gauges and jots notation on paper. / Bridgeman Images

AVE8928525: 1960s: Man studies gauges and jots notation on paper. / Bridgeman Images

AVE8928530: 1960s: Man in top hat drives horse and carriage through city streets. / Bridgeman Images

AVE8928535: 1960s: Movement of clouds. / Bridgeman Images

AVE8928536: 1960s: Subway train pulls up to outdoor station in downtown city. / Bridgeman Images

AVE8928537: 1960s: Cowboys herd cattle in corral at stockyard. / Bridgeman Images

AVE8928547: 1960s: Waves crash into the shore. Clouds in sky. / Bridgeman Images

AVE8928552: 1960s: Families and crowds walk through outdoor street market in city. / Bridgeman Images

AVE8928557: 1960s: Butterflies in garden. / Bridgeman Images

AVE8928558: 1960s: Butterflies in garden. / Bridgeman Images

AVE8928564: 1960s: Hand turns knob on oven thermostat to 325 degrees. / Bridgeman Images

AVE8928565: 1960s: Butterflies in garden. / Bridgeman Images

AVE8928567: 1960s: Caterpillar walks along branch. / Bridgeman Images

AVE8928580: 1960s: Barbed wire fence stands near trees and fields in countryside. / Bridgeman Images

AVE8928582: 1960s: Field sits in between forest of trees. / Bridgeman Images

AVE8928584: 1960s: Caterpillar builds chrysalis. / Bridgeman Images

AVE8928589: 1960s: Caterpillar inside chrysalis. / Bridgeman Images

AVE8928590: 1960s: Caterpillar inside chrysalis. / Bridgeman Images

AVE8928591: 1960s: Boy and girl walk through forest in autumn. Boy and girl play with leaves in forest during fall. / Bridgeman Images

AVE8928596: 1960s: Pedestrians cross busy street in city. Cars and pedestrians clog streets in city. / Bridgeman Images

AVE8928597: 1960s: Pine forest sits on mountainside in valley. / Bridgeman Images

AVE8928607: 1960s: Cat sniffs at walls of enclosure. / Bridgeman Images