<http://schema.org/description>
"There&amp;#039;s no doubt that humans are a violent species. The real question is: Why? Are some  people wired differently than others? Is it a matter of survival? Or are we just taking our frustrations out on others in violent ways?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/life/why-do-we-kill.htm>