This blade is made from printer paper and it can cut through wood like it's butter | Mashable

Inspired by a similar experiment uploaded on YouTube, one bold user cut out a paper blade and used it to slice through wood and plastic.

Using a similar principle, water jets, like Wazer, uses high-pressured streams to cut through almost anything. Ninja Chopping Blade

Optical Fiber Blade It's incredible what you can achieve when you apply pressure in the right way.