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During the Tang Dynasty (618-907), in China , paper was folded and sewn into square bags to preserve the flavor of tea.  The first Wester...

As the drinking cup existed before the recorded history, hence the original inventor of the drinking cup is not known.  The drinking cup w...

ATM, vending machines receipts, bus ticket, use thermal printing. . It is based on the principle of thermochromism, a process of change i...