The headline is interesting on its own, but I was actually more curious about the breakdown of chemicals available in Martian soil. One of the things that makes the Moon less attractive as a site for a permanent colony is the lack of elements needed for organic life. Having enough nitrogen available in the soil to have once supported life suggests that agriculture on Mars might be sustainable without outside intervention (ie launching nitrogen rich asteroids at the surface of the planet.) Nitrogen is essential for plants and other biological processes. In addition, nitrogen currently represents less than 3% of Mars' scant atmosphere, a figure that would have to be raised during any attempt at terraforming.
First, a word about how I came to pick up the first novel in R. Scott Bakker's The Prince of Nothing historical fantasy series. In short, after finishing "A Dance with Dragons," by George R.R. I googled what should I read next. This series came up. I mention this because it might serve as a usual gauge for what to expect from "The Darkness That Came Before;" people liking Martin's mix of history, in-depth characterization, dark subject matter, and world-building will probably like Bakker's work. People not fond of entire chapters devoted to the Byzantine political maneuvers, a dozen pages of appendices on characters, maps, and language trees, or character names with umlauts should avoid this book. Basically, the story of 'The Darkness That Comes Before," follows a warrior monk by the name of Anasürimbur Kellhus, who during a quest to find his father, becomes entwined with a Holy War against a nation of fanatical monotheists. The story is...

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