A hilarious, cheeky, and thoughtful one-woman show making its Quad Cities debut, Iowa City playwright/actor Janet Story Schlapkohl's Invisible but Dangerous enjoys a special limited run at Davenport's QC Theatre Workshop December 6 and 7, treating audience to fraught, funny tales of everything from Midwestern politeness to mansplaining to those containers of spices that stay in your kitchen, unused, for decades.