So you’d need the living brain of a scientist as brilliant as Einstein.
Not necessary living. And Einstein’s brain just happens to be preserved.
In fact, it sounds very much like people quarreled over magical ingridients:
Harvey then removed, weighted and dissected into several pieces Einstein’s brain; some of the pieces he kept to himself while others were given to leading pathologists. [....] Harvey also removed Einstein’s eyes, and gave them to Henry Abrams.[2] He was fired from his position at Princeton Hospital shortly thereafter for refusing to relinquish the organs.
Not necessary living. And Einstein’s brain just happens to be preserved.
In fact, it sounds very much like people quarreled over magical ingridients: