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CrowdScience - When did humans first discover soap? - 大象传媒 Sounds

From: CrowdScience

When did humans first discover soap?When did humans first discover soap?

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Ancient soap was made from two less clean-sounding ingredients: wood ash and fat

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CrowdScience
When did humans first discover soap?
Ancient soap was made from two less clean-sounding ingredients: wood ash and fat
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