Schizophrenia is believed to be solely a disease of the brain. But in an ironic twist, Malaspina’s quest for understanding – one that has taken her around the world – has led the right back to a parent. Only this time it’s the father. Malaspina has found that about a quarter of all schizophrenics may owe their symptoms to spontaneous mutations in paternal sperm. And the older the father, the more likely his sperm is to carry such mutations.