The current issue of SciAm has an article saying "nanobacteria" (as "fossilized" in Mars meteorites) are just crystal formations that look a lot like tiny bacteria. The authors demonstrated growth of "nanobacteria" in solution.<p>Tiny online excerpt: <a href="http://www.scientificamerican.com/article.cfm?id=the-rise-and-fall-of-nanobacteria" rel="nofollow">http://www.scientificamerican.com/article.cfm?id=the-rise-an...</a>