లాగిన్ చేయి
1940s: Man points to two symbols written on chalkboard then begins writing other symbols on chalkboard.
1950s: Kids in classroom, boy takes book from other boy, boys fight. Woman turns from chalkboard. Boy exits. Woman at desk. Boy sitting at desk. Woman exits with kids.
1970s: Children speed walk around a race track. Sports announcer behind desk speaks to camera. Finger traces a picture of a sports field.
1970s: Boys and girls wait at starting line. Children run down the lanes of a race track. Boy runs through finish line ribbon. Stopwatch. Reporter in office holds stopwatch, speaks into microphone.
1980s: Views of workers, machines welding in factory. Car engine, pan to man working. Rear view out of moving car. Zoom out on field. Men at blackboard. Man at computer. Men look at papers.
United States CIRCA 1950s: Man uses flat side of chalk and covers entire chalkboard with it. Man erases chalk covering board with eraser. Man holds and separates eraser pieces.
UNITED STATES: 1950s: man speaks to class. Girl listens in classroom. Boy draws on chalk board.

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1093938227
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స్టాక్ వీడియో ID: 1093938227

1970s: Sports announcer sits at desk with "Metric Games" poster on wall, speaks to camera. Man writes on chalkboard the speed of light in kilometers per second.

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