Stone Tools
Did you know that Stone Age people’s tools weren’t as primitive as we might think? They made knife blades and arrowheads—like the one shown below—out of volcanic glass called obsidian. The obsidian blades were very sharp. In fact, they could be 100 times sharper and smoother than the steel blades used for surgery in modern hospitals. Today some doctors are going back to using these Stone Age materials. They have found that blades made from obsidian are more precise than modern scalpels. Some doctors use obsidian blades for delicate surgery on the face because the stone tools leave “nicer-looking.” scars.
Drawing Conclusions How do you think modern obsidian blades are different from Stone Age ones? | 
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