Summary:

- This article discusses the concept of "assembloids," which are 3D brain organoids grown from human stem cells. These assembloids are helping scientists study the development and organization of the human brain.

- Assembloids can mimic the early stages of brain development and provide insights into how different regions of the brain form and connect with each other. This is important for understanding neurological disorders and potentially developing new treatments.

- The article explains that while assembloids are not a perfect model of the human brain, they offer a valuable tool for researchers to explore the complex processes involved in brain formation and function in a controlled laboratory setting.