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Well..interesting tidbit about the testosterone thing. Jacob's Syndrome, a chromosomal abnormality that ends up with males having an XYY genotype, have been suggested [not proved] to be more violent than others. They do have higher testosterone levels. The reason for believing they are more aggressive is due to prisons having a slightly higher population level of Jacob's Syndrome men than what we expect the general population to have. Like I said, though, it hasn't been proven - just an interesting little side note.
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