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Papermaking became an important industry in China. For more than 500 years, the Chinese were the only people in the world who knew the secret of making paper.
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The Chinese started building ships with separate, watertight compartments. Builders divided the ships into sections and sealed each section with caulk, which is a water tight material.
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The earliest Chinese steel was made from cast iron. The Chinese were the first to learn how to make cast iron by
melting and molding iron ore. Later they learned that blowing air into molten, or melted, cast iron causes a chemical
reaction that creates steel. Steel is a great deal stronger than iron. -
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Earth itself is like a giant magnet with north and south poles. The Chinese also found out that if you put a piece of lodestone on wood and float it in a bowl of water, the lodestone will turn until it points in a north-south direction.
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People walked on a treadmill to turn the paddlewheel, which in turn moved through the water, moving the boat forward.
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To print from the block, the printer covered the characters
with black ink. Then he spread paper over the block and
smoothed the paper with a brush. Some artists still use
block printing today to create fine art prints. -
Aichemist accidently invented gun powder when they were try ti enable us to live forever.
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flamethrower. Early flamethrowers contained gunpowder mixed with oil. The Chinese used them to spray enemies with a stream of fire.
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Rockets were powered bya black powder made of saltpeter, charcoal, and sulfur. At first, rockets were used only in fireworks. Later, the Chinese used them as weapons.
