Ever wonder what makes human brains different from other animals? The answer could come down to a single cell. A new study out of Yale University identified 109 cell types shared with all primate species – but found one cell type, a ‘microglia’, that appears only in humans. That human-specific microglia could hold the secret of what makes human brains special – but researchers say it could also be what leaves humans susceptible to neuropsychiatric diseases like autism or schizophrenia. Do you think we’ll ever fully unlock the secrets of the human brain?