Getting sufficient DNA out of a rootless hair has long been considered impossible. A scientist, better known for work with ancient fossils, has figured it out. It's a game-changer for crime and surveillance.

Those fortunate enough to have a head of hair generally leave 50 to 100 strands behind on any given day. Those hairs are hardy, capable of withstanding years or even centuries of rain, heat and wind.

The trouble for detectives, or anyone else seeking to figure out who a strand of hair belonged to, is that unless it contains a root, which only a tiny percentage do,

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