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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. What is blood for? What is it made of? How does it circulate throughout our body? What happens to it when it is attacked by a virus? And what is bone marrow for? What happens when it malfunctions? C'est pas sorcier explains everything about this gold that flows through our veins. Fred, Jamy and Sabine have pushed open the doors of the French Blood Establishments. This is where donations are made. This is also where the blood is transformed and prepared to be transfused. But how do we avoid the risks of transmitting infections?