Researchers at the University of Cambridge reported creation of three‑dimensional embryo‑like structures—termed hematoids—that recapitulate early human developmental events including the emergence of blood‑forming stem cells. The work, published in Cell Reports, uses pluripotent stem cells to model early hematopoiesis and provides a scalable system for studying human blood development in vitro. The model offers a new platform for dissecting the cellular and molecular steps that generate hematopoietic stem cells and for preclinical screening of factors that could enable production of transplantable blood stem cells. Authors emphasized ethical and technical controls in constructing embryo‑like structures and framed applications in disease modeling and regenerative medicine. If reproducible and translatable, hematoids could accelerate discovery around blood disorders and provide a preclinical route to cell therapies that now rely on scarce donor sources.