About 10 years ago, finishing up High School, I had work practice at a company developing a product that would cool the brain without cooling the rest of the bo

About 10 years ago, finishing up High School, I had work practice at a company developing a product that would cool the brain without cooling the rest of the body. I think they had mixed results, and I haven't seen them or their competitors launch their products. It works though, but it seems very difficult to cool the brain without chilling the whole body.