It's the no shit Sherlock story of the day.
Study: Spanking Kids Leads to More Aggressive Behavior
I could have told you that without reading this story. We all know kids who were beaten (the illegal kind of beating) by their parents end up beating their own kids. So it's obvious that spanking (the legal kind of beating) will make kids more aggressive. So I think it's time to outlaw spanking.
Of course, some parents will have a fit if spanking is banned, but luckily when it is banned, they won't be able to take it out on their kids.