Whether you work with preschoolers, elementary-age or older kids, head injuries are going to happen. And the reality is teachers are often on the front line when it comes to concussions. Here’s what you need to know. What is a concussion? A concussion is “a type of brain injury that changes the way the brain normally works.” A bump, blow, or jolt to the head can cause a concussion. “Concussions can also occur from a fall or blow to the…