oxygen

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WRITER FUEL: Why Does Most Life Breathe Oxygen?

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Oxygen molecule - Deposit Photos

We think of oxygen as life, sustenance, a literal breath of fresh air. But it’s actually a very reactive element. Anyone who’s burned a log has witnessed this firsthand. So why do so many life-forms breathe oxygen? There are probably thousands of kinds of metabolisms, or chemical processes that maintain life, said Donald Canfield, a … Read more

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Writer Fuel: Was Mars Once Much More Like Earth?

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Mars terraformed - deposit photos

A collection of rocks scattered on an ancient shoreline on Mars might indicate that the Red Planet was once far more Earth-like than scientists previously thought. The rocks, discovered by NASA’s Curiosity rover, are unusually rich in manganese oxide — a chemical that adds to growing evidence that the once-habitable Mars may have sported Earth-like … Read more