AVE6327824: 1950s: Young woman speaks in front of chalkboard / Bridgeman Images

AVE6327830: 1950s: Young man in college classroom raises hand / Bridgeman Images

AVE6327841: 1950s: Male professor stands next to tape player / Bridgeman Images

AVE6327844: America, c.1990s: Medium close up: Astronaut in space receives telecom instruction while trying to attach capture bar on satellite / Bridgeman Images

AVE6327850: America, c.1990s: Medium shot: Astronaut in space receives telecom instruction while attaching capture bar on satellite / Bridgeman Images

AVE6327855: America, c.1990s: Medium shot: Astronaut in space receives telecom instruction while attaching capture bar on satellite / Bridgeman Images

AVE6327856: America, c.1990s: Long shot: Astronaut in space receives telecom instruction while trying to attach capture bar on satellite / Bridgeman Images

AVE6327859: 1950s: Young man speaks from seat in college classroom / Bridgeman Images

AVE6327860: America, c.1990s: Robotic arm controllers maneuver astronaut, on STS-49 mission, toward a rotating satellite / Bridgeman Images

AVE6327863: 1950s: Young man holds book in college classroom / Bridgeman Images

AVE6327872: 1950s: Young woman in audience gestures and speaks / Bridgeman Images

AVE6327874: 1950s: Young woman sits down in audience / Bridgeman Images

AVE6327878: 1960s: Woman places child in crib / Bridgeman Images

AVE6327880: America, c.1990s: Robotic arm controller assist astronaut on STS-49 mission in installing capture bar on rotating satellite / Bridgeman Images

AVE6327883: 1960s: Woman attaches car seat belt / Bridgeman Images

AVE6327884: America, c.1990s: Medium shot: Robotic arm controllers maneuver astronaut, on STS-49 mission, toward a rotating satellite / Bridgeman Images

AVE6327888: America, c.1990s: Perspective from exterior of space shuttle Endeavour / Bridgeman Images

AVE6327891: 1960s: Hot liquid bursts from test tube / Bridgeman Images

AVE6327892: America, c.1990s: Medium close up: Astronaut in space receives telecom instruction while installing capture bar on satellite / Bridgeman Images

AVE6327893: America, c.1990s: Astronaut in space receives telecom instructions while attached to a robotic arm / Bridgeman Images

AVE6327898: 1960s: Girls smile / Bridgeman Images

AVE6327910: 1960s: Glass tube over Bunsen burner flame / Bridgeman Images

AVE6327914: 1960s: Broken glass on table / Bridgeman Images

AVE6327916: America, c.1990s: Video from inside space shuttle Endeavour of satellite in orbit / Bridgeman Images

AVE6327917: 1960s: Hands hold glass tube over Bunsen burner / Bridgeman Images

AVE6328122: Europe, 1940s: boy stands by wall / Bridgeman Images

AVE6328126: Europe, 1940s: boy in street / Bridgeman Images

AVE6328132: Europe, 1940s: people walk to funeral in black clothes / Bridgeman Images

AVE6328133: Europe, 1940s: sign for village / Bridgeman Images

AVE6328134: United States, 1960s: Microscopic image of slide / Bridgeman Images

AVE6328147: Europe, 1940s: hand fills container with water / Bridgeman Images

AVE6328148: Europe, 1940s: man in uniform stands on roof of building / Bridgeman Images

AVE6328149: Europe, 1940s: hunger title / Bridgeman Images

AVE6328150: United States, 1960s: man writes E=MC2 on blackboard / Bridgeman Images

AVE6328155: Europe, 1940s: man on roof / Bridgeman Images

AVE6328157: Europe, 1940s: bones on ground / Bridgeman Images