Iceland has one of the highest rates of legal gun ownership globally. The country has about 300,000 people and an estimated 90,000 guns. Interestingly enough, it also has one of the lowest rates of violent crime in the world. – WTF Fun Facts
violent crime
WTF Fun Fact – Lead Gasoline And Crime
Studies have shown that removing lead from gasoline is one of the factors that lead to the drop in the violent crime rate in America in the 1990s. Individuals exposed to lead at young ages have numerous conditions and problems with impulse control, all of which may negatively impact decision making and lead to a life of violent crime as they reach adulthood. – WTF Fun Facts
Source: https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis