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<p>Enceladus: Hello dear friends! Welcome to our podcast. I'm Enceladus, and with me today is Erinome. Today, we’re going to talk about a super interesting question: Why is donating 400ml of blood totally safe, but losing 400ml of blood in an accident can be really dangerous? Erinome, have you ever thought about this? </p><p>Erinome: Oh, yes! I saw this question online last week, and I was so confused. Like, 400ml is 400ml—why the big difference? </p><p>Enceladus: Let’s start with blood donation first. Do you know what happens before someone donates blood? </p><p>Erinome: Um… I think they check if you’re healthy, right? Like, your body must be okay to donate. </p><p>Enceladus: Exactly! The news says before donating, doctors check your blood pressure and blood tests. They make sure you’re a healthy person—no big illnesses. Only healthy people can donate, you know? </p><p>Erinome: That makes sense. And how do they take the blood? Fast or slow? </p><p>E...