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Better view Contact lenses are small-sized lenses worn over the eye for clear vision. First thought of the lenses is Leonard da Vinci ... -
The emergence of flatiron The first electric iron is heated by an electric arc between carbon rods and that was very dangerous. In 188... -
Up to less than zero (to the point of frost) In severe winter cold, we need warmth; of course I do not mean the warmth of the family. An...