“The best time to plant a tree was 20 years ago. The second best time is now.” Origin uncertain, usually attributed as a Chinese Proverb.
Friday, 16 December 2016
What is a zeptosecond - not a lot!
A team in Germany have measured helium photoionization with zeptosecond precision. This is
the greatest accuracy of time determination ever achieved, as well as the first
absolute determination of the timescale of photoionization.