D. tag on a chain.

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It's still not clear at what distance the exchange was intercepted -- while the passive ISO 14443 tag is spec'd with a read distance of only 2-milimeters you'll find claims of reads at several meters.

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We'd like to be able to tag and share interesting locations for later research, or bring up predicted future traffic information so we could plan trips better, or contribute back restaurant ratings on the fly or... you get the idea.

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So the founder of Mann's Jewelers in Rochester was cautious but intrigued when an email arrived at his store from a woman wondering if he could possibly be the Irving Mann whose military tag she said she'd found a day earlier in her barley field in France.

WSJ: NY WWII vet receives long-lost dog tag from France

"If someone came through these doors with a big price-tag and a huge ego they'd get laughed at, " said the 6ft 2in American.

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After all, the World War II veteran didn't recall losing a dog tag after landing in Normandy with the 90th Infantry division on D-Day and fighting across Nazi-occupied France.

WSJ: NY WWII vet receives long-lost dog tag from France