Recess is a highlight of the school day for most kids, but it can also be the most dangerous. Injuries that occur on a swing, climber or slide can be as, if not more, severe than a bike or auto accident. According to the Centers for Disease Control and Prevention (CDC), about 45 percent of playground accidents cause severe injuries: think fractures, concussions, and internal injuries, among others. About 75 percent of injuries occur on public playgrounds, the CDC noted. Children are also especially vulnerable to emotional injuries.