Thought for the month

“In the choice between changing one’s mind and proving there is no need to do so, most people get busy on the proof.” John K. Galbraith, Economist (1908 – 2006).

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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