During that time, your hair shaft absorbs chemicals from any drugs ... uses special techniques to look closely at your hair under a microscope. The results can show details about your health ...

Under a microscope, each of your individual hairs looks like a thick tube. This structure is called a filament, or hair shaft. A strong protein called keratin is what most of your hair is made of.

Bamboo hair is a hair shaft abnormality that causes the hair strands to look similar to the knots in a bamboo stalk. Normal, healthy hair strands appear smooth under a microscope. Bamboo hair ...

Forbes contributors publish independent expert analyses and insights. I cover chemistry, from its small molecules to its big questions. On TV, once a forensic expert finds a match for that lone ...