Many scientists are trying to answer that question as a practical matter, not a metaphor. They are scouring the blood for biomarkers - easily measured substances that illuminate what's going on in hard-to-reach places."I don't think it's ever going to be very accurate in terms of predicting how long someone is going to live.""There are too many random factors; too much stuff can happen. But if it's monitored at several time points, it could tell you whether you're going in the right direction or not."Blood has many roles in the metaphorical life of the human body. It's the organ of kinship ("blood ties"), the seat of emotion ("blood lust") and a vehicle for identity ("travel is in his blood"). But might it also be a window on the body's fate?
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