At a one thousand foot altitude, every cubic meter of air contains 1,000 microbes. At ground level there are 100,000 per cubic meter. On every square centimeter of human skin, there are 10 million microbes. A teaspoon full of dirt has 50 billion microbes. Belly button bio-diversity A Universe Not made For us The Pale Blue Dot The Pale Blue Dot Hubble Deep Field: The Most Important Image Ever Taken

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