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On this month's Health Check, Claudia Hammond and Tulip Mazumdar learn about the life-giving and life-saving properties of blood. They find out why it's important to know your blood group, and why traditional blood donation campaigns have failed to work in Ghana. Claudia goes inside a futuristic chamber to learn about a treatment for carbon monoxide poisoning. And Tulip discovers what would happen to her insides if she were bitten by a deadly snake.