[dmd]

> taking a clock to a mountain

http://www.leapsecond.com/great2005/tour/

[belter]

They also did the First Atomic Clock Wristwatch...

http://leapsecond.com/pages/atomic-bill/

[cmroanirgo]

Fantastic! Has this been shared on HN before?

> We would come back about 20 ns older compared to her [the wife who stayed behind].

≥ Or, the other way to look at it (since this is relativity after all), is that she would become 20 ns younger than us upon our return. Note to husbands: this could be a useful gift idea for your wife.

[pvg]

It has, in the HN equivalent of the Archean eon

https://news.ycombinator.com/item?id=598090