Obsidian: The Sharpest Rock on Earth (and in Surgery)
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In this third Volcano Minisode, Katy digs into one of the coolest things a volcano has ever made: obsidian—a rock so sharp it's been shaping human history for 30,000 years and is still used in modern surgery. 🔪🖤
🌋 What exactly is obsidian and how is it formed?
⚡ How can lava turn into volcanic glass in a flash?
🩺 Why are obsidian scalpels sharper than steel—and still used today?
🛡 How did ancient people turn this into tools, weapons, and even mirrors?
From Stone Age scrapers to eye surgery scalpels…
The skinny
The skinny isn't ready yet — notes appear once the transcript is processed.