Answer:
Gunpowder, paper, printing, and the compass are sometimes called the Four Great Inventions of Ancient China. Kites were first used as a way for the army to signal warnings. Umbrellas were invented for protection from the sun as well as the rain. ... They invented the abacus in the 2nd century BC.
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No, cats can help rid of the rats that cause the black plaque.
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Answer:
Americans experienced a dramatic rise in the availability of new time-saving appliances for the household during this period.
Explanation:
