Arsenic Life Is Nice; Living Clouds Are Nicer Ok, now we have arsenic life. But here's a much wilder thought: How about living clouds? I assume you've read the news. To life as we know it, with carbon, oxygen, nitrogen, hydrogen, sulfur and phosphorous, we can now add life with arsenic. Dr. Felisa Wolfe-Simon fed a little bacterium daily doses of the dread element, and the little guy slurped it up, chucked most of its phosphorous, and became an arsenic-creature. "It's a really nice story about adaptability of our life form," chemist Gerald Joyce told the New York Times, "It gives food for thought about what might be possible in another world." Well, here's one possibility. The otherwise sane and respected astrobiologist David Grinspoon has been considering that under the right circumstances, clouds could become living things. With intelligence, even. Carl Sagan thought so, too. A living thing, it is thought, needs to feed, grow, copy and evolve and persist. It needs some kind of shape. Clouds can do all that, says David Grinspoon. Though they look hazy and random here on Earth, they contain levels of order, they hold themselves together, they move around, they have routines. They can, in theory, produce increasingly complex forms of themselves. Says Grinspoon: http://www.npr.org/blogs/krulwich/2010/12/03/131783352/arsenic-life-is-nice-living-clouds-are-nicer