On Spanking

This is an excellent article from Slate about what science and psychology research says about hitting, spanking, or otherwise using physical punishment against children. The bottom line: it works in the very very short term but has a variety of damaging effects in the long term (both for the child and the parent). The author also points to a UN initiative toward a universal ban on violence against kids, including corporal punishment at home. Some other highlights:

• More than one-third of all parents who start out with relatively mild punishments end up crossing the line drawn by the state to define child abuse: hitting with an object, harsh and cruel hitting, and so on. Children, endowed with wonderful flexibility and ability to learn, typically adapt to punishment faster than parents can escalate it, which helps encourage a little hitting to lead to a lot of hitting.
• The negative effects on children include increased aggression and noncompliance—the very misbehaviors that most often inspire parents to hit in the first place—as well as poor academic achievement, poor quality of parent-child relationships, and increased risk of a mental-health problem (depression or anxiety, for instance). High levels of corporal punishment are also associated with problems that crop up later in life, including diminished ability to control one's impulses and poor physical-health outcomes (cancer, heart disease, chronic respiratory disease).
  
• If you hit another adult you can be arrested and sued, after all, so shouldn't our smallest, weakest citizens have a right to equal or even more-than-equal protection under the law? In this country, if you do the same thing to your dog that you do to your child, you're more likely to get in trouble for mistreating the dog.