For almost 200 years, doctors have described the same pattern of behaviour we now call ADHD. Today, it's biology you can see on a brain scan — a practical explanation for how the brain works. Al Jazeera's Basel Ghazoghli breaks it down. Al Jazeera English @AJEnglish · 2026-07-29 你的浏览器不支持视频播放。 0:00 / --:--