Astronomers have detected a mysterious X-ray anomaly that might be a signal of dark matter, the elusive, invisible stuff that makes up most of our universe.
The coldest, dimmest white dwarf star ever detected is so cool that its carbon has crystallized, forming - in effect - an Earth-sized diamond in space.
The human language that we know today arose from a fusion of birdsong and the pragmatic, content-carrying parts of speech of other primates, say researchers
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