Curious Cases - Rutherford and Fry - What is the sharpest natural material in the world? - 成人快手 Sounds

Curious Cases - Rutherford and Fry - What is the sharpest natural material in the world? - 成人快手 Sounds


Rutherford and Fry

Hannah Fry hears about a volcanic glass which can cut through flesh and bone.

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