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1940s: Albert Einstein stands near bookshelf and speaks.

1940s: Albert Einstein stands near bookshelf and speaks.

1940s: Alcatraz Island through moving car window on Golden Gate Bridge. Homes and hillsides of Marin county. Overlooking foggy Marin valley of homes.

1940s: Alcatraz Island through moving car window on Golden Gate Bridge. Homes and hillsides of Marin county. Overlooking foggy Marin valley of homes.

1940s: Aluminum sample is tested in tension machine. Large furnaces and quenching units in aluminum treatment plant. Man opens door to industrial furnace.

1940s: Aluminum sample is tested in tension machine. Large furnaces and quenching units in aluminum treatment plant. Man opens door to industrial furnace.

1940s: Animated alpha particles move between beryllium and polonium in cross-section of nuclear reactor. Animated radioactive particles move from polonium through beryllium plate.

1940s: Animated alpha particles move between beryllium and polonium in cross-section of nuclear reactor. Animated radioactive particles move from polonium through beryllium plate.

1940s: Animated alpha particles move between beryllium and polonium in cross-section of nuclear reactor. Animated radioactive particles move through plates toward detector.

1940s: Animated alpha particles move between beryllium and polonium in cross-section of nuclear reactor. Animated radioactive particles move through plates toward detector.

1940s: Animated boxes text appears.

1940s: Animated boxes text appears.

1940s: Animated cross-section of miniature reactor reveals needle and alpha particles. Electricity flows from animated reactor to wires and switches. Positive and negative ions diverge in chamber.

1940s: Animated cross-section of miniature reactor reveals needle and alpha particles. Electricity flows from animated reactor to wires and switches. Positive and negative ions diverge in chamber.

1940s: Animated doors light up in text boxes. Piles of schematics and paperwork appear. Animated doors light up in text boxes.

1940s: Animated doors light up in text boxes. Piles of schematics and paperwork appear. Animated doors light up in text boxes.

1940s: Animated doors light up in text boxes. Preliminary report files appear. Animated doors light up in text boxes.

1940s: Animated doors light up in text boxes. Preliminary report files appear. Animated doors light up in text boxes.

1940s: Animated doors light up in text boxes. Program for the 1913 Transcontinental Conference appears.

1940s: Animated doors light up in text boxes. Program for the 1913 Transcontinental Conference appears.

1940s: Animated doors move through text boxes. Date appears over animated text boxes.

1940s: Animated doors move through text boxes. Date appears over animated text boxes.

1940s: Animated drawing of a grounded circuit appears over exchange map. Grounded circuit transforms into a metallic surface. Line moves from Boston to New York City.

1940s: Animated drawing of a grounded circuit appears over exchange map. Grounded circuit transforms into a metallic surface. Line moves from Boston to New York City.

1940s: Animated drawing of a man shaking rope with weights appears over exchange map. Animated drawing of a repeater coils and telephones appears over exchange map.

1940s: Animated drawing of a man shaking rope with weights appears over exchange map. Animated drawing of a repeater coils and telephones appears over exchange map.

1940s: Animated drawing of a telephone wires appears over exchange map. Animated drawing of a man shaking rope with weights appears over exchange map.

1940s: Animated drawing of a telephone wires appears over exchange map. Animated drawing of a man shaking rope with weights appears over exchange map.

1940s: Animated drawing of a telephone wires appears over exchange map. Lines connect dots across map of the United States.

1940s: Animated drawing of a telephone wires appears over exchange map. Lines connect dots across map of the United States.