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1950s: Old professor puts tube on the table and points forward. Students sit in lecture hall, woman bites pencil. Man speaks and moves his head. University students sit in lecture hall and listen.

1950s: Old professor puts tube on the table and points forward. Students sit in lecture hall, woman bites pencil. Man speaks and moves his head. University students sit in lecture hall and listen.

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1950s: Hand writes words on paper with pen. Hand moves paper. Boy looks up and thinks while sitting at a desk.

1950s: Hand writes words on paper with pen. Hand moves paper. Boy looks up and thinks while sitting at a desk.

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Head Shot of Boy Talking to Friends. Boy Talks to Friends. Picture of Volleyball and Words 'Stick to Subject'. Model Camp Site in a Box. Girl Looks at Model Camp Site in Box and Speaks. Boy Answers Girl. Boy Points at Lake in Model Camp Site Box

Head Shot of Boy Talking to Friends. Boy Talks to Friends. Picture of Volleyball and Words 'Stick to Subject'. Model Camp Site in a Box. Girl Looks at Model Camp Site in Box and Speaks. Boy Answers Girl. Boy Points at Lake in Model Camp Site Box

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