Over 90 percent of serial killers are male
They tend to be intelligent, with IQ's in the "bright normal" range
They do poorly in school, have trouble holding down jobs, and often work as unskilled laborers.
They tend to come from markedly unstable families.
As children, they are abandoned by their fathers and raised by domineering mothers.
Their families often have criminal, psychiatric and alcoholic histories.
Many serial killers are fascinated with fire starting.
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