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Unlike the majority of paper you encounter on a daily basis (which is made from wood pulp), the paper U.S. currency is made from is 75 percent cotton and 25 percent linen fibers.
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Earthworms don’t have hearts like mammals, but they do have “aortic arches” to help circulate blood. What aortic arches lack in complexity, however, is made up for in numbers—earthworms have five of them spread throughout their long bodies.
