Did you know there is a Shampoo conspiracy?
Shampoo has only been used with fervor since the 1970s. Before then, either regular soap was used a few times a month or, just after the early 20th century, shampoo was used only a few times a year. It was in the 1970s that shampoo use became prevalent. Ads featuring Farrah Fawcett and Christie Brinkley asserted that it was unhealthy not to shampoo several times a week.
I mentioned this to my dad, a long-time Prell user. He was surprised. This didn’t fit with his memory. He said that in 1963, when he was first married, he used Prell and Head and Shoulders. It looks like this is one of those times my father was setting trends. Fourteen years later, in 1977, the New York Times reported that those two shampoos were the most popular (according to a footnote in the Wikipedia article).
I think its impressive how little it takes to generates a controversy. The No poo wiki page is (like the first linked article in this blog post) filled with assertions with nothing to back them up. I would expect to see a controversy around articles like Creationism (and, indeed, Creationism’s talk page is filled with warnings about the proper place to debate the validity of the topic) but there is quite a lot of discussion on Shampoo’s talk page. I guess I shouldn’t be surprised that people become so impassioned about (what I consider to be) a prosaic topic.