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Life in the Air

Posted by Josh Rothman  January 4, 2011 11:20 PM

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Earth's human population is projected to hit 7 billion by the end of 2011. That's a pretty big number, but it pales in comparison to this amazing finding: every cubic meter of air could be home to up to 100 million microorganisms. Noah Fierer, a biologist at the University of Colorado, Boulder, is hoping to map their habitats.

Biologists have known for a long time that the air is teeming with life; airborne bacteria are actually one of the surfaces on which water vapor condenses to form clouds. (The same is true of snowflakes.) It's not so much its existence as its incredible diversity that's surprising. As Vanessa Schipani explains at The Scientist, new DNA sequencing technologies have helped researchers measure airborne biodiversity. In urban areas, life in the air is roughly as diverse as life in the soil.

Two questions now need to be answered. First, is the air just a temporary home for microbes - or is it an actual long-term habitat? Second, how does the large-scale presence of life in our atmosphere affect other processes, like weather or soil cycles? Fierer aims to sample the air in around two hundred locations nationwide, developing a data set that could be used for further research.

In a way, one can't be too surprised by discoveries like these - everywhere you look, there's life of some kind. Robert Hooke, whose 1665 book Micrographia first brought microscopic images to the world's attention, wrote of the Earth that "in every little particle of its matter, we now behold almost as great a variety of creatures as we were able before to reckon up on the whole Universe it self." Incredibly, it's as true now as it was then.

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About brainiac Brainiac is the daily blog of the Globe's Sunday Ideas section, covering news and delights from the worlds of art, science, literature, history, design, and more. You can follow us on Twitter @GlobeIdeas.
Brainiac blogger Kevin Hartnett is a writer in Columbia, South Carolina. He can be reached here.

Leon Neyfakh is the staff writer for Ideas. Amanda Katz is the deputy Ideas editor. Stephen Heuser is the Ideas editor.

Guest blogger Simon Waxman is Managing Editor of Boston Review and has written for WBUR, Alternet, McSweeney's, Jacobin, and others.

Guest blogger Elizabeth Manus is a writer living in New York City. She has been a book review editor at the Boston Phoenix, and a columnist for The New York Observer and Metro.

Guest blogger Sarah Laskow is a freelance writer and editor in New York City. She edits Smithsonian's SmartNews blog and has contributed to Salon, Good, The American Prospect, Bloomberg News, and other publications.

Guest blogger Joshua Glenn is a Boston-based writer, publisher, and freelance semiotician. He was the original Brainiac blogger, and is currently editor of the blog HiLobrow, publisher of a series of Radium Age science fiction novels, and co-author/co-editor of several books, including the story collection "Significant Objects" and the kids' field guide to life "Unbored."

Guest blogger Ruth Graham is a freelance journalist in New Hampshire, and a frequent Ideas contributor. She is a former features editor for the New York Sun, and has written for publications including Slate and the Wall Street Journal.

Joshua Rothman is a graduate student and Teaching Fellow in the Harvard English department, and an Instructor in Public Policy at the Harvard Kennedy School of Government. He teaches novels and political writing.


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