Different Cities Have Different Smells. How To Detect A Chemical Attack

Knowing Your City's Scent Could Help DARPA Prevent Chemical Attacks Andrew Mason on Flickr

DARPA Wants To Detect Chemical Attacks By First Mapping Every City's Normal Scent -- Popular Science

Then, if something goes wrong, a quick whiff will let them know.

Don't mind those folks sniffing around the gas station - they're researchers. DARPA has a new scheme to identify the distinctive chemical scent of your city, to help protect you from chemical terrorist attacks.

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