For generations, obsessive-compulsive disorder, Tourette syndrome, and autism were mapped as separate territories of the mind, each with its own borders and its own explanations. Now, through the precise lens of whole-exome sequencing, researchers have found that these conditions share genetic pathways — molecular threads woven through all three. The discovery invites a quieter, more humbling question: how many of the boundaries we draw around human suffering are truly natural, and how many are simply the limits of what we once knew how to see.