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Watch Modern Marvels online: Episode 22 Saws

They have the sharpest teeth known to man, but only bite on command. They brought down the forests and built up the pyramids. Some have used them to torture, others to cure. They're a cut above for construction, salvage, demolition - and they even make music. Modern Marvels "Saws" sinks it's teeth into the razor sharp world of saws where 800-pound blades spin at 200 miles per hour to fell huge trees in under a second. We'll cut across the centuries to reveal how the Egyptians laboriously sawed stone and compare that to modern saws that slice through limestone like butter. The contrast between East and West is equally sharp in the saws of the two cultures, and we'll reveal the keys to successful sawing on both sides of the globe. With teeth of steel, carbide or diamond, the blades on Modern Marvels "Saws" are on the cutting edge.

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