Millions use shampoo daily without knowing it literally means 'to press' or 'to knead.' This word didn't originate in a 1950s laboratory but traveled from South Asia, where it held a completely different meaning. Discover how a tactile, human practice became a modern clinical product.

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More from Sticky Note Podcasts:
Deep in the Stacks (daily jazz vinyl) | Required Drinking (cocktail history) | Photography Knowledge (daily photo tips)
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