I recall the time Inspector Lestrade called my friend Mr Sherlock Holmes in, when Lord Featherstonehaugh-Cholmondsley-St.John-Beauchamp was murdered.
As he closely examined the body, he suddenly stiffened and asked me for a pair of tweezers. I took a pair from my bag and handed it to him.
He removed a hair from under the body, drew his magnifying glass from his pocket and studied it for some time. Eventually, he spoke.
“The murderer is of fair complexion. He had a reasonable childhood, but when he attended school, his peers treated him with contempt. After leaving, he went from place to place, but was always rejected by society. This, combined with his quick temper, constantly lead him into conflict. He is a badly troubled man – anti-social and very dangerous.”
“Incredible, Holmes,” I ejaculated. “How can you tell all that from a single strand of hair?”
“Elementary, my dear Watson,” Holmes replied, “The hair is ginger.”