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					Originally Posted by Wormius  I am surprised bear bells are allowed to be sold as such.   I haven't heard anything about their efficacy. | 
	
 
There was a good study by a renown bear biologist (I think it was Dr. Tom Smith?) that proved them useless. 
REI promptly persuaded him to not release it with much fanfare since it's a 5+ million dollar business for them. 
They're basically the homeopathy of the outdoor world.