Genetics: my professor was the text author. He said that the information in chapter [let's pretend it's # 27] was bleeding edge when he wrote it six months prior to publishing, but it was out of date by the time it published and was very out of date now, a year later.
He gave us all his notes on the current version of the chapter and told us about the research coming in a few weeks that up render his new chapter obsolete so don't study too close.
I can't imagine publishing an up to date genetics text

