In the article, if you read all of it, they suggest point to a study that suggests a better helmet may be of no use in preventing the injury. If you search for

In the article, if you read all of it, they suggest point to a study that suggests a better helmet may be of no use in preventing the injury. If you search for "animal" in the article, you should find it. On the other hand, if the majority of people who want to join the army understand the dangers they face (in addition to death and dismemberment) then we might find that they held a war, and nobody came.