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Soap was first invented in 1811.
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William Sheppard patented liquid soap.
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Ivory soap, one of the most popular brands of soap, was created when a worker left the machine on too long, creating more air to be trapped in the soap.
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Any point before the 1930s, people used regular bar soap to clean their hair.
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Shampoo was first invented in the 1930s.
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Herbal Essences, one of the most popular brands of shampoo, was created.
