Just curious....
Thars rocks and possibly metals in some of them thar "comets" in more than flea shit on a rat's ass quantities.
Do you have a source for this? The closest I could find was 'Elemental composition of cometary bodies in comparison to flea fecal material on a rodent's hindquarters' in the Journal of the Royal Acadamy of Astrophysics and Parasitical Defecation, Vol. 213 pg 5499 (1998)...
