Scientists presents evidence that adults can generate new brain cells, and that this process is dramatically altered in patients with long-term epilepsy. The study details the presence of newborn neurons and an immature version of a related cell type, known as astroglia, in patients with epilepsy, furnishing new evidence of neurogenesis in adults and new insights into how immature astroglia might contribute to epilepsy. The study also opens an unexplored avenue toward the development of new anti-seizure medications for millions of people.