A disorder related to
hyperactivity and distraction.
I have it, and I know I'm not an expert. I'm just saying, I speak from experience when I say it's freaking hard to get one thing done all at once. You usually get distracted by something else, and then eventually come back to that first task.
This doesn't mean you can't get something done, it just means that work typically takes a lot longer because you're inclined to go look something up or do something RIGHT that second. Hell,
I'm procrastinating right now making this definition when I'm supposed to be doing
biology homework.
I shouldn't even have to acknowledge these people, but to everyone who thinks that all people with ADHD are stupid are seriously wrong. Most people with ADHD are gifted.