How is wood useful to us
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Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. In Medieval Europe oak was the wood of choice for all wood construction, including beams, walls, doors, and floors.
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A great deal of the paper and cardboard people use is made by turning cellulose from trees into a fibrous pulp, for example. Lignin (the other main chemical inside wood) also has many uses, including making plastics (such as the celluloid used in old-fashioned photographic film), paints, turpentine, and yeast products.
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