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The trendiest hairstyles from the ’90s were all about volume. There was the supermodel-esque voluminous blowout, big, fluffy bangs, and, of course, “the Rachel.” And since practically all beauty ...

Each day, radio signals from key communications and navigation satellites travel freely through a layer of Earth’s atmosphere known as the ionosphere. Floating 50 to 400 miles (80 to 643 kilometers) ...

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The Earth’s ionosphere protects us from harmful UV radiation, but despite the helpful protection, this slice of Earth’s atmosphere is incredibly complex. NASA’s Global-scale Observations of the Limb ...

The variations of the root canal anatomy along its root length present major challenges with respect to thorough debridement and proper obturation. 9,18 Thus, correct diagnosis and identification of ...