Please factor in how trauma shrinks the brain. You should include the experience teachers have with their students to understand the learning process. How students benefit co-creating together, how quickly they acquire knowledge that way. Stubbornness also is key to increasing one’s intelligence. Some young minds are so stubborn and determined to acquire knowledge they supersede those with a higher IQ. Classroom sizes need to be smaller as well in order to help each student. What is challenging for teachers is when the progress made with students who are at high risk is undone over the weekend or holiday. Please consider diet and food and how that affects the brain. The worst behaviors can be undone through a healthy diet. When there is inflammation in the gut, the child’s brain is foggy and the child feels frustrated. I don’t agree with a lot that Richard Haier is stating here. I have seen siblings raised in the exact same environment where one is driven and the other is lazy. The one who became successful was the driven and disciplined one, where the lazy one struggled. Are you considering personality traits versus the expression of the genes for intelligence?