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Yeast is a tiny single-celled fungus found in air in the form of invisible spores. Only 1,500 types of yeast are known, representing an estimated 1 percent of existing species. Since 4000 B.C., yeast has been used as a leavening agent for raising breads and cakes and fermenting beers and wines.
Read MoreLearn to identify 6G welding, the most commonly used kind of weld to test a welder for certification. The letter "G" stands for the type of weld, which is a grooveweld and the number "6" designates the position of the pipes welded.
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