The “big bad wolf” — that sinister character of scary bedtime stories — is getting a makeover. Not only do wolves and other large predators pose little threat to humans, they also play a central role in keeping ecosystems flourishing, Oregon State University researchers assert in a new film showing at the 2010 Salem Film Festival on Oct. 18. FES professors Robert Beschta and Bill Ripple will speak about their research at the festival along with the showing of the film at 5:30 p.m., Sunday, Oct. 17, at Salem Cinema, 1127 Broadway St. N.E., and again at 6:30 p.m., Monday, Oct.