There may be a connectedion to reductions in lead-poisoning. https://en.m.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis https://en.m.wikipedia.org/wiki/Lead%

There may be a connectedion to reductions in lead-poisoning. https://en.m.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis https://en.m.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesi...