Meghan, 23, began experiencing hallucinations at 19. "Driving home, cars' headlights turned into eyes. The grills on the cars turned into mouths and none of them looked happy. It would scare the crap out of me," Meghan says. Marvi Lacar for NPR hide caption

itoggle caption Marvi Lacar for NPR

Officers Ned Bandoske (left) and Ernest Stevens are part of San Antonio's mental health squad — a six-person unit that answers the frequent emergency calls where mental illness may play a role. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

Images of the developing fetal brain show connections among brain regions. Allen Institute for Brain Science; Bruce Fischl, Martinos Center for Biomedical Imaging, Massachusetts General Hospital hide caption

itoggle caption Allen Institute for Brain Science; Bruce Fischl, Martinos Center for Biomedical Imaging, Massachusetts General Hospital

Homer Bell's family: sister Laura Bell (from left), sister Regina Bell, mother Rosalind Scott and stepfather Jack Wilcox. Jeff Cohen/WNPR hide caption

itoggle caption Jeff Cohen/WNPR