5 Mar
2018
5 Mar
'18
6:11 p.m.
https://physics.aps.org/articles/v11/22?utm_campaign=weekly&utm_medium=email... Clock consists of 10,000 Sr atoms in an optical lattice cooled to 15 nK. If this clock had been started at the big bang, it would today be off by 100 ms. == Gene