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You might guess that the United States is the world\\u2019s biggest exporter of corn, but did you know that it is also one of the biggest exporters of blood? In fact, the U.S. exports more blood than it does corn, soybeans, or gold. More specifically, blood plasma - the yellow liquid that separates out, once your blood is in a tube or a bag - since it is a critical component in many pharmaceutical products and medicines. Rose George, author of \\u201cNine Pints: A Journey Through the Money, Medicine, and Mysteries of Blood\\u201d walks us through the economics, science, and ethics behind the blood industry.