Thought for the month

“As I grow older, I pay less attention to what men say. I just watch what they do.” Andrew Carnegie, businessman and philanthropist (1835-1919).

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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