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Facts of the Matter

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Column: Complex systems keep air breathable on Earth

Outside the window, 7 miles up, the wings of the jet airliner slice through the invisible air that seems magically to keep it aloft. It reminds me that we are immersed in Earth’s invisible atmosphere all of the time. Read more

With metals running low, scientists look to space

We use metals for so many different purposes that a list would go on page after page. The most common and most well known are iron and aluminum. It just happens that these are the two most abundant metals in Earth’s crust. Read more

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