What you eat ends up in your hair. Scientists in the US and Europe have used this basic idea to devise a sort of hair-based GPS tracking system. Law enforcement agencies are now using this technique to solve crimes. NOVA's Ari Daniel Shapiro reports.
A team of scientists from California is touring European natural history museums to photograph ant collections. The images are being posted to a free website so anyone can study. Ari Daniel Shapiro of our partner program NOVA reports from London.
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