[_drimzy]

> What we observe could be explained by many other more convincing factors: early learning activity, more care to the child's education, logical and clear answers to the kid's questions about the world around him, help with the homework, etc. With proper early learning activity for the baby, and amazing teachers for the early teachings, the kid has a strong foundation. From there, compound returns.

I don't see why that would be more convincing. As a hyperbole, if two completely different species (say a monkey and a primate) are exposed to the same learning environment, one would definitely end up fairing better than the other due to the differences in their brain. The twin studies just show that, given most other factors for twins are likely to be the same.