obviously “nurture” doesn’t even explain it. Identical twins who grow up together often don’t look that much alike and have completely different health issues and personalities.
Epigenetic changes during gestation cause phenotypic changes in the trajectory of development. Environmental toxins and variations in nutrients also change the way the initial software load of DNA plays out.
Really? I’ve never heard that. Every identical twin set I’ve ever know personally or read about, look pretty much identical, and have more similar physical experiences than do non-twins.