What I'm going to say is tangential to the article's main issue (scientific fraud), but I take issue with the "essential" in the headline. Not only there was science going on without peer review, there are some very proeminent examples of it, too. None of Einstein's annus mirabilis were peer reviewed. Einstein didn't care much for peer review either. Later on, when Physical Review tried to peer review one of his papers with Rosen, he chose to submit the paper elsewhere.
More about it in: https://hsm.stackexchange.com/questions/5885/how-did-the-pub...