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David M. Shribman: Is America losing its heroes? - Salisbury Post
The Salisbury Post· 6 days agoOne of them, Robert Persichitti, 102, died en route to the commemoration. Then, just a few days ago, William Anders, the Apollo 8 astronaut remembered for snapping the “Earthrise” photograph ...
Explained: What Is a Supernova?
ExtremeTech· 4 days agoEvery so often, a mysterious so-called "guest star" appears in the sky, often far outstripping its cousins in brightness. Astronomers and stargazers have known about such events since at least ...