Scientific American has an interesting blog post on Nick Herbert's attempt to create a faster than light communication device several decades ago that led to the discovery of the "no-cloning
theorem": which states an arbitrary or unknown quantum state cannot be copied
without disturbing the original state.
Exploding Stars Are Rare—but if One Was Close Enough, It Could Threaten
Life on Earth
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Stars like the sun are remarkably constant. They vary in brightness by only
0.1 percent over years and decades, thanks to the fusion of hydrogen into
heliu...
1 day ago