Scientists at the University of Cambridge and collaborators reported creation of three‑dimensional embryo‑like structures—'hematoids'—from human stem cells that recapitulate early developmental stages and generate blood stem cells. The model provides a tractable platform to study the origins of hematopoiesis and could accelerate work on blood stem cell production for therapy. The paper in Cell Reports details molecular and functional characterization of the structures; authors say hematoids enable mechanistic dissection of early lineage decisions and may reduce reliance on scarce donor tissues in preclinical research. Ethical and regulatory oversight will guide next steps as models advance.