Submission + - This tiny plant is helping solve crimes (sciencedaily.com) 1
alternative_right writes: Because different moss species thrive in very specific micro-environments, tiny fragments can reveal exactly where a person has been.
Excessive login or logout messages are a sure sign of senility.
I think I saw this on Bones (TV) back in the day (Score:1)
It might've been some other plant or other living creature (probably a bug, the show had a "bug guy" forensic scientist), but the concept was the same.