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1940s: Koala eats eucalyptus leaves. Children walk through koala park. Children stare at tree. 1940s: UNITED STATES: animation of circuit board and flow. Positive and negative symbols on circuit. Tank circuit. 1940s: Baby koala buries head into mother koala. Baby koala crawls into mother koala 1940s: UNITED STATES: flow of energy around a circuit board. Gate opens and closes. 1940s: Mother koala carries baby on back. Mother koala climbs down tree. Mother and baby koala snuggle on tree branch. 1940s: UNITED STATES: man stands at front of class. Man lectures students on circuits and grids. 1940s: Koala runs along ground. Mother koala carries baby toward tree. Koalas climb up tree. Wild dog stops at tree and barks. Mother and baby koala scale tree. Dog leaps and barks at tree. 1960s: UNITED STATES: boys in monkey masks. Boy on handle bars of bike. Boy pedals 1950s: UNITED STATES: hands on steering wheel of car. Hands turn steering wheel. Pencil sharpener machine.