Blood transfusion is an essential part of modern health care. Used correctly it can be a life-saving intervention. Inappropriate use can endanger life through potential complications, such as transmission of infectious diseases, such as HIV or hepatitis. The decision to transfuse blood should therefore always be based on a careful assessment of clinical and laboratory indications that transfusion is necessary to save life or prevent significant morbidity. This work is an accessible learning tool to assist prescribers of blood when making clinical decisions on transfusion.

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The authors of Complex Worlds from Simpler Nervous Systems explain how animals with small, often minuscule, nervous systems—jumping spiders, bees, praying mantids, toads, and others—are not the simple "reflex machines" they were once thought to be. Because these animals live in the same world as do much larger species, they must meet the same environmental challenges. They do so by constructing complex perceptual worlds within which they can weigh options, make decisions, integrate unique experiences, apply complex algorithms, and execute plans—and they must do this with thousands rather than the billions of neurons necessary for their larger counterparts.