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Explainer: What is a superconductor?

Materials can be divided into two categories based on their ability to conduct electricity. Metals, such as copper and silver, allow electrons to move freely and carry with them electrical charge. Insulators, such as rubber ...

dateMar 05, 2015 in Superconductivity
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New X-ray actions revealed

Potentially destructive high-energy electrons streak into Earth's atmosphere from space, not as Shakespeare's "gentle rain from heaven," but at velocities approaching the speed of light.

dateJul 23, 2015 in Space Exploration
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