Allowed the use of firearms in warfare
Changed the way people could add subtract divide and multiply.
Made by using mullberry and other fibres along with fish nets old rags and hemp waste
Detected earthquakes up to 400 miles away.
Used to transport supplies, needed two men to operate
Known as Woodblock printing
Probably used Coke(bituminous coal)Flux(Limestone) and Ore to smelt down iron.
Helped revolutionise the way people bought and traded goods.
Put an Iron needle in a bowl of water. The needle always aligned itself to the south.
Used bamboo tubes.Helped change warfare and space exploration...eventually.