The only vitamins which the clerk in the grocery and the cook in the kitchen know about are A for clear vision, B for sound nerves, C for healthy muscles and D for sturdy bones. Nutritionists, however, know that there are at least six kinds of vitamin B, eight D's, three H's and a K. Each of these should be assigned a separate letter, according to the nomenclature suggested by Casimir Funk, a Polish biochemist who in 1911 invented the word vitamin to describe these food elements essential to good health. But there are not enough letters in the English alphabet...
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