Eighty percent of Americans will be the victim of violent crime at least once in their lifetime.
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In 2010, police in Belfast, Northern Ireland, used ice cream van music to calm angry teen rioters - and it worked!
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There have been over 7,200 acts of terrorism against the US over the last 15 years.
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South Korea has banned under 16s from playing online games between midnight and 6am under the so-called "Cinderella Law".
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