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Men spill it, seal friendships with it, and, if they’re aging rock guitarists, have it purified at Swiss clinics. But blood also tells a detective story. Just as the amount, color, odor, and feel [...]

The blood test is, when you think about it, a remarkable thing. With the prick of a needle, the molecules coursing through your veins can be extracted, centrifuged, and translated into a stream [...]