It's not a cycle.  Free helium will escape from the atmosphere due to
its high velocity.  It won't be practical to recover it.  It has
to be mined.


-- 
----------------------------------------------------------------------------
Gordon Banks  N3JXP      | "Skepticism is the chastity of the intellect, and
geb@cadre.dsl.pitt.edu   |  it is shameful to surrender it too soon." 