Every birth carries within it a quiet question about what might be saved and shared — and for decades, cord blood banking has answered that question imperfectly, collecting what it could not always use. A research team has now built a two-step nomogram that reads the signals already present in routine prenatal and postnatal care, identifying with 94.3% accuracy which newborns are likely to yield cord blood worthy of transplantation. The tool asks nothing new of clinicians or families; it simply listens more carefully to what medicine already knows, and in doing so, it transforms waste into wis