AVE6327083: Berlin, 1936: Female athlete completes discus throw in slow motion, Olympic officials measure the distance / Bridgeman Images

AVE6327094: Berlin, 1936: Athletes compete in a running marathon / Bridgeman Images

AVE6327109: United States, 1960s: trees on hill slope / Bridgeman Images

AVE6327112: United States, 1960s: Columbus Day parade in street / Bridgeman Images

AVE6327122: United States, 1960s: beach in Cuba / Bridgeman Images

AVE6327132: United States, 1960s: man waves plane forward, Planes take off for Cuba / Bridgeman Images

AVE6327133: United States, 1960s: men look out at ship on ocean / Bridgeman Images

AVE6327149: United States, 1960s: President boards ship / Bridgeman Images

AVE6327151: United States, 1960s: Soviet Minister speaks to American President / Bridgeman Images

AVE6327152: United States, 1960s: map of planned missile launch / Bridgeman Images

AVE6327155: United States, 1960s: President Kennedy speaks to audience about Cuba / Bridgeman Images

AVE6327160: United States, 1960s: empty shelves / Bridgeman Images

AVE6327164: United States, 1960s: President Kennedy signs quarantine order / Bridgeman Images

AVE6327168: United States, 1960s: President Kennedy signs quarantine order / Bridgeman Images

AVE6322514: United States, 1980s: signal transduction chain research in plants / Bridgeman Images

AVE6322515: United States, 1980s: people walk through building in park / Bridgeman Images

AVE6322516: United States, 1980s:close up of spirals and plant growth in space / Bridgeman Images

AVE6322784: Person driving car from the backseat / Bridgeman Images

AVE6322787: Flag raises, close up of pulley, construction workers send a bucket down for more tar / Bridgeman Images

AVE6322788: Construction worker sends up a bucket of hot tar to another worker / Bridgeman Images

AVE6322790: Man using a pulley on the back of a tow truck to life a car's front end / Bridgeman Images

AVE6322792: A man uses a lever to open a box / Bridgeman Images

AVE6322793: A man uses a hammer to drive a nail, woman sweeps with a broom, child plays with a baseball bat, child lifting a box with a crowbar / Bridgeman Images

AVE6322801: A boy rides a bicycle up a steep hill, another boy bikes up a more gradual sloping road / Bridgeman Images

AVE6322811: An airplane is shown flying, a close up on a bicycle wheel is used to describe how a screw operates / Bridgeman Images

AVE6322813: A pan across shows a pencil sharpener, crowbar, pulley, inclined plane, wedge, and a screw all layed out on a table / Bridgeman Images

AVE6322816: Children playing on a merry-go-round, children chatting while riding bikes down a road with mountains in the background / Bridgeman Images

AVE6323685: United States, 1960s: men test car designs / Bridgeman Images

AVE6323693: United States, 1960s: Cars test driven on proving ground track / Bridgeman Images

AVE6323695: United States, 1960s: engineers collect data on cars at proving ground site / Bridgeman Images

AVE6323698: United States, 1960s: cars crashed into wall in safety test research / Bridgeman Images

AVE6323699: United States, 1970s: lady answers questions in street interview / Bridgeman Images

AVE6323707: United States, 1960s: crash test dummy in car / Bridgeman Images

AVE6323710: United States, 1960s: man gets out of test car / Bridgeman Images

AVE6323712: United States, 1970s: man watches as electric instruments stop playing / Bridgeman Images

AVE6323714: United States, 1970s: teenagers talk and smile in pop band / Bridgeman Images