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 […]
In studies at the University of Sussex in the United Kingdom, horses were able to recognize differences in human facial expressions. Using photographs depicting positive and negative human facial expressions, the 28 horses used in the Sussex study showed changes in heart rate when they were shown the photos. Increased heart rate indicated an understanding […]
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