New studies of Damascus swords are revealing that the legendary blades contain nanowires, carbon nanotubes, and other extremely small, intricate structures that might explain their unique features. Damascus swords, first made in the eighth century A.D., are renowned for their complex surface patterns and sharpness. According to legend, the blades can cut a piece of silk in half as it falls to the ground and maintain their edge after cleaving through stone, metal, or even other swords. But since the techniques for making these swords have been lost for hundreds of years, no one is sure exactly why these swords are so good.

I think this is cool because I bet the people who created the swords in those days they all probably didn't know that they were making something so small, sophisticated, and nano type.