Since ancient times, human beings have made commercial transactions using different elements.
Did you know that the oldest form of currency that has records is the cows? Also, people have used curious forms of currency such as soap, cocoa beans, elephants, grains, animal skins, feathers, snuff, bird claws and even bear teeth.
But in the eighth century the Chinese invented paper money and marked one of the greatest milestones in the development of humanity.
The US$ are made of 75% cotton and 25% linen, according to the US Bureau of Engraving and Printing.
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