[тотальная слежка][параноикам по всему]Концы в воду.

PBS recently ran a story about how some scientists are using human hair to trace where a person has been. The combinations of different isotopes in water make for somewhat unique signatures from place to place. These isotopes get placed in growing hair strands which can then be traced back to identify where a person has been."



http://www.pbs.org/wgbh/nova/tech/strands-of-evidence.html