Medieval scholars were particularly fascinated by the science of optics and invented eye glasses partly as a result of their studies using lenses to determine the nature of light and the physics of sight.

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Imagine the heat in the summer, the bitter cold in the winter, and Mandela going out to quarry stone, the burning white light reflecting off the limestone permanently and deeply injuring his sight.

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It may bring to light some cases in which accusations were kept under wraps and the accused were kept out of the sight of the law or accusers.

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