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the greatest invention in human history

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(1)The answer is soap. Before the 1700s, Europe had a pandemic
(2)Due to skin diseases, life expectancy was only under 40 years old, and in 1790, when soap invented by French chemist Nicholas LeBlanc began to spread, hygiene improved and various diseases began to disappear little by little

Soap

It is said to be the object that saved humanity the most

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