Children who write with both hands are twice as likely to have difficulty in school, suffering from hyperactivity disorder syndromes and struggling with language, according to a new report. This might be caused by differences in the brain’s wiring, experts say, although more research on the ambidextrous is needed. In the study of 8,000 children in Finland, 87 of whom were ambidextrous, those who could use both hands at 7 or 8 were twice as likely as right-handed peers to have difficulties with language, and perform badly in school. By age 15 or 16, they were at twice the risk of symptoms of Attention Deficit Hyperactivity Disorder (ADHD), and their symptoms appeared to be more severe. Other studies have linked it to dyslexia. Around one in 100 people are ambidextrous, reports the BBC, and which hand a person uses is linked to the brain’s left and right hemispheres: those who use their right hands have a more dominant left hemisphere.