Thirdname, there are genetic differences in peoples intelligence but these are smaller than first thought. For everyone there is a wide envelope of variation around the base point that depends on experience, encouragement and self-belief. Surprisingly little is really known and understood about the brain, it seems that research goes on and on. What's true is that most of us are capable of more than we think.
I thought like you when I first started reading up on all of this. It really is true that what one person can learn pretty much anyone else can learn. Sure, you may learn more slowly, sure there will be the small percentage of extremely gifted people that can do more, sadly those with real learning impairments won't reach the same level, but EVERYONE else can learn what the person sitting next to them can learn. I know I bang on about it on here but Dweck's 'Mindset' really does, I think, prove this. She and others have done a huge amount of research.
The danger is if you believe that the person sitting next to you has more inherent 'ability' it puts a ceiling on how far you think you can go and how far you will be prepared to try. What's the point? It's not very smart, is it, waste of time if your partner/friend at the next table has more ability, you can never be as good.
I thought like this and it stopped me, right in my tracks at 7 years old when I couldn't draw a combine harvester like my friends. Well there were many different incidents, you get my drift. . If someone had messaged to me that I COULD do what the top table were doing with effort, and time it would have made the world of difference to how I saw myself and more importantly how I learned.
It was if a fog descended and an anxiety, I thought I didn't understand what I was being told, I daren't tell anyone when I was stuck for fear of judgement (I was at the limit of my ability - yikes don't tell anyone, no way out)! Why did they get it and I didn't? Then I gave up, decided I'd never get Maths etc and spent my lessons writing in my notebook in the back of the class.
Think you'll agree not really a conducive environment to learning or a great attitude and I expect I can't be the only one.
This is why I worry about the concept of 'ability' tables. Claig you are spot on again about what I was driving at. I think if everyone called them 'attainment' tables and parents and children alike believed that they were about where a child was currently with their learning it would be a great stride forward. Most I know believe that there are 'clever' and 'slow' children in the class and these labels tend to stick - more from the parents than the teachers I'd add.
If 'ability' is deeply entrenched in the classroom then the danger is it makes re-categorising a child very difficult. A run of poor results in an 'able' child is perhaps a result of problems at home, or getting in with the wrong crowd. A 'slow' child that suddenly does well is credited with a surge of effort when the reality may just be that the labels were not so black and white in the first place.
I also don't like it when parents and others talk about 'ability' in children as I think it can be so self limiting for all the reasons I've mentioned, no ability has a ceiling.
By the way I didn't know that about Riven, very interesting and wonderful to hear.