Posted by Jack Boyd (152.163.201.46) on July 11, 1999 at 21:08:56:
In Reply to: Allergy and CH posted by Allan on July 11, 1999 at 08:47:15:
I have always felt that clusters might be similar to allergies in that clusters may be provoked by some external stimuli ( such as change in amount of light or who knows what) .