The world’s first known toothbrush was described in a Chinese encyclopaedia in 1498. The toothbrush was made from pig bristles set into a bamboo handle. This new bastion of dental hygiene spread to Europe some 150 to 200 years later. ag
Casio introduced the first electronic calculator in 1957, sparing children from having to learn how to do long division with pencil and paper – or the abacus. The 14-A calculator could add, subtract, multiply, and divide numbers up to 14 digits long. The
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