For decades, the presence of translucent green stones in the lavish tombs of ancient Panamanian chiefs puzzled archaeologists.
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For decades, the presence of translucent green stones in the lavish tombs of ancient Panamanian chiefs puzzled archaeologists.
Microscopic analysis of 600-year-old medical instruments from China has revealed the world's oldest direct chemical evidence of a topical anesthetic.
It’s the early third century BC.
Morel et al/The Conversation