My God. Did Hiroshima and Fukushima teach us nothing?!

@ Adrian - I'm pretty sure there is quite a large difference between an atomic explosion and measuring the orbit of an electron. Especially convincing is the fact that atomic clocks have been running in the U.S. (and possibly other places around the world) since the 1950's. I'm no physicist but i'll take the sixty some odd year safe track record as an indication that there really isn't much to worry about in an atomic clock.

There are very few catastrophic failures of nuclear power plants. When there are, there are also explanations which explain why it was not down to the actual process of making power, but an external factor like human intervention or earthquake. It's incredible to me that people like you opt away from the only answer to our power needs. Renewable power sources can't produce enough power to keep our word going, and the harmful side effects from burning coal wont do. So unless you have an answer to the worlds power needs other than nuclear power... consider your opinion. oh yeah cool clock...

Interesting. Perhaps it could be used to (re)verify the theory of relativity experiments.

"My God. Did Hiroshima... teach us nothing?!"
Well, it taught us that dropping atom/nuclear bombs on cities is a ghastly, cataclysmic thing to do, WHICH IS WHY IT'S NEVER HAPPENED AGAIN.
A pretty good lesson, really...

Good for experiments. Time and seconds are defined in relation to natural phenomenon. First it was earth's revolution around the sun, which wasn't accurate. Then a definition in relation to caesium 133. Now with such accuracy, the definition will again change. And soon time may have no relation to time of day. The day itself is related to the time. This has caused problems with nature's natural cycles built within man, at the pineal gland in the brain. This will result in greater anxiety, depression and rage in the future, both adults and children. Combined with isolated environment of time, media and gaming consoles, the results can be catastrophic.

> My God. Did Hiroshima and Fukushima teach us nothing?!
You have to burn your dictionary because they contain the words nuclear and atom.

Lesson of Fukushima
If your reactor needs pumps to prevent overheating make sure they run off the reactors heat.

While you are at it - please set it a couple minutes slow so I will always be on time!

...and lesson #2 of Fukushima backup generators: don't put them at or below ground level where they can flood and fail. Doh!