AVE6324212: United States 1950s: Two scientists operate a robotic arm, via remote control, to work with atomic materials in a testing chamber / Bridgeman Images

AVE6324214: United States 1950s: Long shot of the plant industry station in Beltsville, MD / Bridgeman Images

AVE6324216: United States 1950s: A scientist closes a cement door to a radiation testing chamber / Bridgeman Images

AVE6324224: United States 1950s: A researcher removes a bag from the top of a cornstalk, collecting the kernels as he does so / Bridgeman Images

AVE6324228: United States 1950s: A lab technician carefully handles a bottle of radioactive medicine / Bridgeman Images

AVE6324229: United States 1950s: A doctor ties a band around a Leukemia patient's arm / Bridgeman Images

AVE6324231: United States 1950s: A doctor raises a piece of radiation equipment to the upper back of a shirtless patient / Bridgeman Images

AVE6326143: 1980s: Bi-plane taxis down runway and takes off / Bridgeman Images

AVE6326145: 1980s: Several men work to put wing of airplane together / Bridgeman Images

AVE6326148: 1980s: Man positioned in scaffolding around airplane, while working on it / Bridgeman Images

AVE6326156: 1980s: Jet plane flies through air / Bridgeman Images

AVE6326158: 1980s: Two men position model airplane in wind tunnel / Bridgeman Images

AVE6326161: 1980s: Small, personal plane takes off from runway at airport / Bridgeman Images

AVE6326165: 1980s: Pilot sits in cockpit of plane while man talks to him / Bridgeman Images

AVE6326169: 1980s: Three men watch tv monitor where airplane dives / Bridgeman Images

AVE6326184: 1980s: Jet flies through air attached to plane above it, then drops / Bridgeman Images

AVE6326185: 1980s: Jet rockets through air / Bridgeman Images

AVE6326186: 1980s: Man in flight suit rides escalator / Bridgeman Images

AVE6326192: 1980s: X-15 rockets away from wing of plane / Bridgeman Images

AVE6326196: 1980s: Man climbs into cockpit of X-15 / Bridgeman Images

AVE6326207: 1970s: Man in lab / Bridgeman Images

AVE6326208: 1970s: Man with equipment / Bridgeman Images

AVE6326220: 1970s: Underwater footage of diver / Bridgeman Images

AVE6326233: 1970s: Dolphin floats by diver's hand / Bridgeman Images

AVE6326260: India, c.1930: A pan follows men and older boys, all dressed in topis and mundus, walking across a rural field / Bridgeman Images

AVE6326270: Divers swimming with fish, 1970s / Bridgeman Images

AVE6326283: 1970s: Men help diver out of wet suit / Bridgeman Images

AVE6326319: United States, 1960s: Police officers in the tactical force arrive near a scene of disturbance and prepare their equipment / Bridgeman Images

AVE6326321: United States, 1960s: Police officers convene in an area near a disturbance to prepare themselves to control a riot / Bridgeman Images

AVE6326331: United States, 1960s: A police officer informs a mob riot that if they do not stop their actions and disperse, people will be arrested, but the crowd continues its destruction anyway / Bridgeman Images

AVE6326334: United States, 1960s: The tactical formations by a police unit in disruption destructive mob behavior are introduced / Bridgeman Images

AVE6326338: United States, 1960s: Police forces use their batons to try to break up an angry mob / Bridgeman Images

AVE6326346: United States, 1960s: Men and women try to push back against police officers who use their batons to push them back / Bridgeman Images

AVE6326363: United States, 1960s: Two police officers attempt to take protest leaders into custody, but they are unrelentless / Bridgeman Images

AVE6326366: United States, 1960s: Police officers carry protest leader into the back of a truck by his arms and legs / Bridgeman Images

AVE6326370: United States, 1960s: As police officers place tear gas grenades on the floor, sit down protesters get up and disperse / Bridgeman Images