A chimera is a fascinating creature from mythology, often depicted as a mix of different animals. In ancient Greek stories, it was described as having the body of a lion, the head of a goat rising from its back, and a serpent for a tail. This combination made the chimera a symbol of chaos and unpredictability, as it blended various traits into one being. In modern science, the term "chimera" is also used to describe an organism that contains cells from two different species. For example, a mouse with human cells is considered a chimera. This research helps scientists understand diseases and develop new treatments, showcasing how the concept of a chimera has evolved over time.