There is a lot of discussion about helmets. For proffesional use; contractors, rescue personal, etc they are pretty much mandatory and not much discussion going down there.
However when it comes down to helmets are recreation, this becomes a discussion. Does a helmet save you from a climbing accident? bike crash? a ski/snowboard crash? Ice skate crash?
Well all sports have there discussion, different dangers and different helmet regulations. Here are some interesting information about ski and snowboard helmets:
http://skicanadamag.com/2011/12/05/gear/helmet-science
http://www.ski-injury.com/prevention/helmet
http://www.nytimes.com/2014/01/01/sports/on-slopes-rise-in-helmet-use-but-no-decline-in-brain-injuries.html?_r=0
In the end the basic conclusion is that a helmet won't increased your survival rate when you hit a stationary object (rock, tree) with high speeds. It does protect your head from slower impacts, which would be far more harmful if no helmet is worn.
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