The need for blood in hospitals has been falling over time, according to a recent RAND Corp. study. It cites new technologies, adoption of less-invasive surgical techniques and reduction in the need for blood transfusions. But blood is still one of the most critical commodities in healthcare. You can’t live very long without it. But you can share some of it. And every two seconds, somebody in the U.S. needs access to it. Download the PDF.