[HarleyD]

Those aren't really atomic clocks. They are just clocks with radio receivers.

That's a relief. I've been wondering what would happen if the nuclear reactor ever exploded on my wrist.

[jaydubya2]

http://tf.nist.gov/stations/wwv.html

NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. WWV is located in Fort Collins, Colorado, about 100 kilometers north of Denver. The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD time code, geophysical alerts, marine storm warnings, and Global Positioning System (GPS) status reports.