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19519
Another hypothesis for the polish on the Stone Age corundum ax head is that the Stone Age people never had absolutely pure corundum, which indeed would have required diamond to polish. It is possible that these people used one grade of corundum to make the ax head and a slightly harder grade to polish it. […]
- Archaeology
In the Buff: Stone Age tools may have derived luster from diamond
Ancient Chinese people may have used diamonds to polish their stone axes to mirrorlike finishes.
- Earth
Sky High: Gamma-ray bursts are common in Earth’s upper atmosphere
Enigmatic bursts of high-energy gamma rays produced Earth's atmosphere are stronger and more frequent than previously thought.
