According to the World Health Organization, approximately 107 million blood donations are collected globally every year.
Nonetheless, blood is often in short supply – particularly in developing nations.
Despite new safeguards, there's also still the risk of incompatibility, or of infections being transmitted from donors to recipients.
Charitable organization the Wellcome Trust hopes to address these problems, by developing the ability to manufacture blood outside of the body. Last week, it announced that test subjects should begin receiving transfusions of blood made with lab-grown red blood cells by late 2016.
Via Ray and Terry's