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Are Ebay Geodes A Scam?

In this video, we cut a huge geode purchased on eBay to determine its authenticity as a valuable find or just a $55 rock.
C&EN

How to detect hidden stars using elemental signatures

SMCSGS-FS 69 became the first observational evidence of a star caught in a predicted but never-seen-before evolutionary phase. A partially stripped star is less hot than the fully stripped ones but ...