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Rickets or rachitis, bone disease caused by a deficiency of vitamin D or calcium. Essential in regulating calcium and phosphorus absorption by the body, vitamin D can be formed in the skin by ...
Chaplin, Charlie (Sir Charles Spencer Chaplin), 1889–1977, English film actor, director, producer, writer, and composer, b. London. Chaplin began on the music-hall stage and then joined a pant...
Vitamin, group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often ...
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