.0000000000000000000001
No -practical use that I know of, but...
"A zeptosecond is a trillionth of a billionth of a second, or a decimal point followed by 21 zeroes and a 1. Previously, researchers had dipped into the realm of zeptoseconds; in 2016, researchers reporting in the journal Nature Physics used lasers to measure time in increments down to 850 zeptoseconds. This accuracy is a huge leap from the 1999 Nobel Prize-winning work that first measured time in femtoseconds, which are millionths of a billionths of seconds."
(From www.livescience.com)
Q. Job applicant: How long will my breaks be?
A. Manager: A few zeptoseconds.
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