AVE8900664: 1960s: Man pets dog on carpet. Dog sits on carpet and pants. / Bridgeman Images

AVE8900671: 1960s: Native Americans inspect tomahawk by thatched shelter. / Bridgeman Images

AVE8900672: 1960s: Native Americans walk along wooden fence past thatched shelter, one holds a tomahawk. / Bridgeman Images

AVE8900684: 1960s: A bunch of feathers tied to a post. Face carvings on logs surround clearing in front of wooden fence. / Bridgeman Images

AVE8900692: 1960s: A Native American man and child walk down grassy path with a dog carrying a little sled. Man unloads from dog’s sled. / Bridgeman Images

AVE8900695: 1960s: The Great Seals of Delaware, New Jersey, Pennsylvania and Virginia sit on display. / Bridgeman Images

AVE8900398: 1960s: Man in black with white collar stands in study facing wall. Man’s son asks him a question, folder tucked under arm. Son picks up suitcase and leaves. / Bridgeman Images

AVE8900399: 1960s: Man in black with white collar stands in study facing wall. Man’s son asks him a question, folder tucked under arm. Son picks up suitcase and leaves. / Bridgeman Images

AVE8900401: 1960s: Family stands in field. Man picks up plow behind ox. / Bridgeman Images

AVE8900402: 1960s: People push boat through marsh. / Bridgeman Images

AVE8900421: 1960s: Crescent moon. / Bridgeman Images

AVE8900422: 1960s: Half of moon. / Bridgeman Images

AVE8900424: 1960s: Light changes to reveal full moon. / Bridgeman Images

AVE8900426: 1960s: Launch pad. People prepare for rocket launch. Vehicles. / Bridgeman Images

AVE8900427: 1960s: Rocket launches into air. / Bridgeman Images

AVE8900432: 1960s: Rocket flies through air. / Bridgeman Images

AVE8900433: 1960s: Launch pad. Rocket launches into air. / Bridgeman Images

AVE8900437: 1960s: Surface of moon. / Bridgeman Images

AVE8900450: 1960s: Animal in utero. / Bridgeman Images

AVE8900453: 1960s: Small turtle crawls through sand. / Bridgeman Images

AVE8900458: 1960s: Mother mouse with babies. Mother digs in bedding. / Bridgeman Images

AVE8900462: 1960s: Fish in tank. / Bridgeman Images

AVE8900470: 1960s: Newly hatched tadpoles rest on a mass of eggs. / Bridgeman Images

AVE8900473: 1960s: Tadpole lays still in a mass of water plants. / Bridgeman Images

AVE8900474: 1960s: Tadpole in a mass of water plants moves suddenly to go deeper inside the foliage. / Bridgeman Images

AVE8900483: 1960s: Bacteria and particles on a slide. / Bridgeman Images

AVE8900485: 1960s: A tangle of sperm cells. One sperm moves slowly. / Bridgeman Images

AVE8900487: 1960s: A tangle of sperm cells. / Bridgeman Images

AVE8900491: 1960s: Zebrafish swim above the grass in an aquarium. / Bridgeman Images

AVE8900494: 1960s: Butterfly eggs on the underside of a leaf. Finger points to the eggs for scale. / Bridgeman Images

AVE8900495: 1950s: Man holds an Edison Gem phonograph on his lap. He spins the handle one way then goes the other direction. / Bridgeman Images

AVE8900902: 1960s: Scientist puts two beakers of water, a bowl, a pestle, a plate, and a beaker of blue rocks on table. With tongs, scientist puts two rocks on plate, then grinds one of them with pestle. / Bridgeman Images

AVE8900907: 1960s: Scientist puts two beakers of water, a bowl, a pestle, a plate, and a beaker of blue rocks on table. With tongs, scientist puts two rocks on plate, then grinds one of them with pestle. / Bridgeman Images

AVE8900917: 1960s: Small house with a thatch roof and unfinished boards. A tripod made of branches hold a pot with plants growing in it. / Bridgeman Images

AVE8900923: 1950s: A locomotive pulls flatcars through a factory. / Bridgeman Images

AVE8900926: 1960s: Line of glass beakers full of liquids or orange powder, with a smaller beaker in front of each. Scientist points at each beaker, then mixes water and powder in small beaker. / Bridgeman Images