Sometimes it’s road rage. In one case it was a customer at a fast food restaurant throwing a burger at a cashier when he discovered they’d forgotten to add the pickles. What triggers the proverbial "straw that breaks the camel’s back?"

Why do adults throw tantrums over small provocations? Shouldn’t we have learned from childhood that indulging in a fit of yelling, whether at a customer-service rep or a spouse, never helps? In fact, sometimes these actions hurt OURSELVES, since they alienate the people who are supposed to help us.
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Scientists have found a gene variation that can cause adultsto become aggressive, antisocial adults when they wereabused as children. This is the first link betweenantisocial behavior and a specific gene.

It helps explain why, although almost all adult criminalshave been abused as children, the majority of abusedchildren grow up to be normal adults.

About one-third of men have the “low-activity” version ofthe gene for monoamine oxidase A (MAOA), an enzyme thatbreaks down neurotransmitters, such as serotonin anddopamine, that give people a positive outlook on life. Theabsence of this gene is linked to aggression.
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