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| Tim rips another wordprocessor apart | Rex and Tim describe magnetic storeage | |
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| Tim looks on at a paper punch card reader | Rex demonstrates a bubblejet printer | |
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| Early man used flammable fats and later gasses | An arc welder rod illuminates the workshop | |
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| A pencil doesn't quite light as much | Tim smashes open a bulb's vacuum | Tim boils water on a halogen bulb |
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| Rex microwaves a fluorescent tube | Rex's trick bulbs help him light the way |
