[TChad]

The researchers measured a delay of up to 12 attoseconds between outgoing s- and d-electrons in helium.

That's some superb measuring.

An attosecond is to a second what a second is to 31.71 billion years.

[Honest Nigerian]

So that is sort of like sex. It is over too soon.
And then you are old. ...... Well, that is what a friend told me.