Pico, Femto, Atto, What is next?

[frist at ccu.umanitoba.ca]

In article 767123466 at ehsc.orst.edu, jenseno at ehsc.orst.edu (Ole N Jensen) writes:
> In article <2ouq9s$i1o at oac4.hsc.uth.tmc.edu> PHEACOCK at utmmg.med.uth.tmc.edu (Philip Heacock) writes:
> 
> >Hello,
> >The title says it all. What is the correct prefix for 10^-21?
> >
> >Thanks in advance,
> >Phil Heacock
> 
> "Zepto" is the prefix for 10^-21 as far as I remember.
> 
> Ole
 
Which leads inevitably to 

Harpo         =    10^-24
Chico         =    10^-27
Graucho       =    10^-30

Brian

P.S.
(For those who are clueless, Zeppo Marx was sort of the
'straight man' of the Marx brothers.)