I'm pretty sure this is part of Brandon Sanderson's master plan to make humanity's culture so awesome that when we finally meet some aliens, they'll be so impressed that they will give everyone free alien-cake.
Beetnemesis in a review
from Regarding Brandon Sanderson's The Way of Kings by Beetnemesis
it could be there are some there naturally - Edit 1
Before modification by LadyLorraine at 02/12/2010 09:01:50 PM
but the specific bacteria they are talking about that was referred to in the conference was induced in a laboratory. They said so rather explicitly in the conference.