As a young man, Denys Stocks was obsessed with the Egyptians. For the past 20 years, this ancient-tools specialist has been recreating tools the Egyptians might have used. He believes Egyptians were able to cut and carve granite by adding a dash of one of Egypt's most common materials: sand.

"We're going to put sand inside the groove and we're going to put the saw on top of the sand," Stocks says. "Then we're going to let the sand do the cutting."

It does. The weight of the copper saw rubs the sand crystals, which are as hard as granite, against the stone. A groove soon appears in the granite. It's clear that this technique works well and could have been used by the ancient Egyptians.

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