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photo by Alecia Hoyt Photography I sport an afro or natural hair, but I use to have a perm. About a year ago, I shared my hair journey with Afrobella at Essence. com: Natural Hair Diary: Danielle N

What's the best way to find out if an unknown mixture contains a specific substance, like an environmental contaminant? You could use an expensive, bulky gas chromatograph--but Harvard researchers have developed an instrument you can carry in your pocket. They describe the device, called an inverse opal, in the Journal of the American Chemical Society .