The human microbiome contains roughly how many bacteria and bacterial species? 
(B=Billion, T=Trillion, s=species)
22% of voters chose the correct answer: Some ~100 Trillion bacteria and 250-500 bacterial species! http://hvrd.me/pxnT309cZMd pic.twitter.com/9faBB8Rba8
6:22 AM - 21 Feb 2017
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