9 July 2013
Updated at 21:29 ET
Optical lattice atomic clock could 'redefine the second'
Rebecca Morelle
Science reporter,
BBC World Service
Optical lattice clock
The optical lattice clock shines lasers on atoms to measure time
Related Stories
Experts mull leap second's future
Time to change the world's time?
The bizarre world of time zones
Scientists say they have found a more accurate way to measure time.
link-
http://www.bbc.co.uk/news/science-environment-23231206