Dogs have been used in warfare since ancient times. In 628 BC, the Lydians deployed a battalion of fighting dogs and in 525 BC Cambyses II used huge fighting dogs against Egyptian spearmen and archers. The Romans trained dogs specifically for battle and equipped them with armor. During the Medieval period, royalty gave each other […]
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The lens of the eye is normally transparent, allowing light through to the retina in back of the eye. A cataract causes the lens of the eye to become cloudy or opaque, decreasing or eventually blocking light to the retina, causing impaired vision and eventually blindness. Cataracts can be hereditary or caused by disease such […]
