The Incas never invented the wheel, never figured out the arch, and never discovered iron. But they were masters of fiber. They built ships out of fiber (you can still find reed boats sailing on Lake Titicaca). They made armor out of fiber (pound for pound, it was stronger than the armor worn by the Conquistadors). Their greatest weapon, the sling, was woven from fibers, and … [Read more...] about The Last Incan Suspension Bridge Is Made Entirely of Grass and Woven by Hand