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Why this 5,000-year-old object has engineers baffled

In the Cairo Museum sits a strange object carved from schist stone — a 5,000-year-old artifact that resembles nothing else ...
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This 5,000-year-old disk may not be what you think

Tucked inside the Cairo Museum is a disk made of fragile stone — shaped with precision we can't explain using known ancient tools. It's called the Schist Disk, and it shouldn't exist. Mike Johnson ...