Research suggests children who write with both hands are more likely to struggle in school and have hyperactivity disorder symptoms. A study by scientists from Imperial College London found ambidextrous children were twice as likely to struggle as their classmates. <br/><br/>They were also more likely to have difficulties with language. Experts told Paediatrics journal the differences might be down to the brain's wiring. The study looked at nearly 8,000 children from Northern Finland, of whom 87 were mixed-handed. <br/><br/>Around one in every 100 people is ambidextrous, or mixed-handed. Lead researcher Dr Alina Rodriguez said mixed-handedness is intriguing and it is not known why some people prefer to make use of both hands when most people use only one.