Blood transfusions have been a crucial part of medicine for more than 80 years. However, they remain subject to many of the same constraints they started with: limited supply, limited shelf life, risk of contamination, and the need to be stored in a carefully controlled environment. Fortunately, we now seem to be on the verge of practically eliminating all of these constraints with so-called “synthetic blood.” What is synthetic blood? What are its strengths and weaknesses? How close is it to commercialization? What are the likely implications? We’ll show you.