What is a concussion? We know you've already heard this many times, so we're just going to do a brief recap.
This is an injury that involves a temporary functional disturbance of the brain caused by a traumatic force, which can lead to a pathophysiological process that can, in turn, manifest in debilitating physiological and psychological symptoms. It can have social consequences as well. These symptoms, as well as the injury experienced, can vary from person to person. We also know that the effects of a concussion are not always observable to an onlooker, so it's very much an invisible injury, too.
We know that our brains are quite fragile. We have a 3-D printed model of a brain just to show that. We know that the consistency of the brain, even more so than in this model, is actually quite like that of Jell-O. That just emphasizes the need to protect it.
We have an example of the mechanism of injury. Here, you're seeing a direct blow to the head. Another way to get a concussion is a blow to the body, which then results in a whiplash effect to the brain and the head.