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Printers used woodblock printing to print the cards from hard paper.
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These clocks were more accurate than earlier time devices. Every hour a chime would go off.
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Before paper money the only currency was coins. Money was printed with wood blocks like the card games.
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The tea was made by letting tea leaves sit in water.
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The first printing technique was called woodblock printing.
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On the boat people would walk on a treadmill to paddle the boat.
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The compass was made of a magnetic mineral called lodestone. Chinese people used to use this to navigate the seas.
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The new ships had watertight compartments.
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The earliest Chinese paper was probably made from hemp and then the bark of the mulberry tree.
