Thought for the month

“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.

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