More bacteria live and work in one linear centimeter of your lower colon than all the humans who have ever lived on Earth.
Adam Rifkin stashed this in Factoids
Source of this factoid: http://balunywa.blogspot.com/2013/05/collection-of-factoids.html
More discussion: http://pandawhale.com/post/40302/gut-bac...
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The picture of bacteria in this factoid is computer generated and comes from: