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focusing on paper which concentrated elementary school kid calculating and writing while learning how to calculate number addition lesson in mathematics class at school. asian student wearing eyeglasses doing homework of number addition on paper. - sum up stock videos & royalty-free footage
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Focusing on paper which concentrated elementary school kid calculating and writing while learning how to calculate number addition lesson in mathematics class at school. Asian student wearing eyeglasses doing homework of number addition on paper.
Mathematics, Child
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electrons at work - part 20 of 22. electrons carry electric charges; they have mass and can move objects by colliding with them. visual evidence that electrons can be found in all kinds of materials is given when a hairbrush rubbed on a cat attracts a ban - sum up stock videos & royalty-free footage
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Electrons at Work - part 20 of 22. Electrons carry electric charges; they have mass and can move objects by colliding with them. Visual evidence that electrons can be found in all kinds of materials is given when a hairbrush rubbed on a cat attracts a ban
Computer, 1960-1969, Archival
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