Take a closer look at the incredible design of blood as David explores human blood cells under the microscope. Discover how blood smears reveal the different types of white blood cells, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, and learn how these cells help defend the body. Then, explore the bone marrow, where blood cells are produced, and see how red blood cells, white blood cells, and platelets develop. From the unique structure of red blood cells to the giant megakaryocytes that produce platelets, this microscopic journey reveals the intricate design and function of the blood.