They don't. But that's just a dance around the undeniable fact that wearing a helmet when you go up and down the stairs is safer than not wearing a helmet. htt

They don't. But that's just a dance around the undeniable fact that wearing a helmet when you go up and down the stairs is safer than not wearing a helmet. https://www.reuters.com/article/us-health-injuries-stairs-idUSKBN1CE1Z4 https://www.reuters.com/article/us-health-injuries-stairs-id...