fargoth
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just searched to see what rf freq was used by NIST, and found this cool wristwatch 
http://www.leapsecond.com/pages/atomic-bill/
The world's first atomic wristwatch
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just searched to see what rf freq was used by NIST, and found this cool wristwatch http://www.leapsecond.com/pages/atomic-bill/
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Orefa
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Wow! I'm off to Wal-Mart. Gotta get me one of those.
LeBrad
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Oddly enough I just got back from hearing a guy talk about this type of stuff, and he said they can now make them around 1cm^3. The one you found must be the older model.
http://www.darpa.mil/mto/csac/index.html
http://www.darpa.mil/mto/csac/index.html