Dry Shampoo and Mad Science

The other day I was asking for dry shampoo recommendations. Today I will give you the results of my inquiries and subsequent experimentation. But first, because I'm tired of answering this question — let me explain the idea of dry shampoo.

For most of my life, I washed my hair every day just because, well, that's what I thought you were supposed to do. But you don't have to. And I don't anymore. In fact, I only wash my hair a couple of times a week, if that — and sometimes I try to time...