Identical Twins - Not Identical Brains

Professor Eric Kandel explains that although identical twins have identical genes, different life experiences mean they do not have identical brains.

Identical twins have identical genes but they don't have identical brains and that is because learning leads to anatomical changes in the brain and even identical twins will have different social experiences, different learning experiences, and therefore will end up having different brains. Every single person in the world, as far as we know, has a slightly different brain than any other person because they've been exposed to somewhat different social and environmental experiences.