Pea-size clusters of human cells called brain organoids inspire both hope and fear. Experts are debating how scientists can responsibly use these bits of gray matter.

A long-term study has identified a potential biomarker that could help detect which patients are progressing toward more severe forms of multiple sclerosis.

Neuroscientists at the University of Sheffield have discovered that your blood type may impact gray-matter volume in brain regions linked to dementia and Alzheimer’s disease. Gray matter consists of ...