19 Oct
2020
19 Oct
'20
8:01 p.m.
Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule. https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -- Gene