YouTuber JohnnyQ90 has shown how you can cut through wood or plastic using just two sheets of normal A4 paper.
He stuck two sheets of paper together and cut out a small circle from it and then attached it to a device that could rotate it.
As the paper rotates centrifugal force (inertial force directed away from the axis of rotation) makes its particles move outwards. This is what makes it rigid enough to cut through wood or plastic.
As soon as the paper stops spinning, it loses its cutting ability and becomes bendable again.
Text Source: Leon Siciliano, UK Business Insider
Video Source: JohnnyQ90 YouTube Channel