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University of Missouri researchers have discovered a new way to harness one of the body's natural defenses: copper. While copper is essential for life and helps power important biological processes, having too much of it can be toxic. To keep copper levels in balance, cells rely on specialized ...
Active black holes are easy to detect. Their superheated accretion disks emit bright X-rays, and the jets streaming from their poles are easily seen at visible and radio wavelengths. But most stellar-mass black holes are inactive.
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No company in the United States has ever restarted a reactor that was seemingly closed for good, but there are now three major efforts underway to do so.
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