The shape of the hills and valleys in the brain is largely conserved across people – but the finer details give a personal and unique reflection of where you’ve been and who you are now. Although most of the changes are too small to detect with the naked eye, everything you’ve experienced has altered the physical structure of your brain – from the expression of genes to the positions of molecules to the architecture of neurons. Your family of origin, your culture, your friends, your work, every movie you’ve watched, every conversation you’ve had – these have all left their footprints in your
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