What I always find interesting is the hidden facts about hair. How "normal" styling kills your hair and how commercial shampoo and conditioners make these completely bogus claims that we all believe. Oh and of course, the math behind why cutting does not make your hair grown longer. That's a good one to finally wrap your head around. (Imagine an inch of damage, that quickly turns into 2 inches of damage. If only you had cut off that one inch, you'd be spared the other inch of crumbing/breaking/etc. Viola! Your hair is longer for having cut it than if you hadn't.)
Basically, all the common misconceptions about hair.
Oh and I love that shampoo was invented not too long ago and yet we all think (used to think) it was a necessity.
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