Definition
A 'castor bean' is the seed of the castor oil plant (*Ricinus communis*), known for producing castor oil. Think of it as a somewhat dangerous beauty queen. π The plant looks nice, but the seeds contain ricin, a toxic substance. Castor oil, when properly processed, is used in cosmetics, lubricants, and some medicines. It's like a plant with a double life, both useful and potentially harmful.