Dr. Alfonso Martinez Arias, a CREA Research Professor at Universitat Pompeu Fabra in Barcelona, shares his journey in developmental biology. He delves into the fascinating world of gastruloids, innovative embryo-like structures, and their potential in organ model development. The discussion also covers resilient tuft cells in the human intestine and their surprising regenerative abilities. Additionally, cutting-edge insights on aging neural stem cells and the role of CRISPR in enhancing their function spark intrigue, emphasizing the future of regenerative health.