Priyanka and Hari explore the science of blood, blood transfusions, and why donated blood remains one of the most essential tools in modern medicine. They break down what blood actually does in the body, the different components of blood, and how blood types determine who can give and receive lifesaving transfusions. They also cover who can donate blood, the issue with blood shortages, and how blood donations save lives. Then they unpack the strange and surprisingly chaotic history of blood substitutes and the ongoing effort to create artificial blood.