Suguru is like Play-Doh on steroids, which is to say you can mold it, manipulate it, and stick it to things. What makes Sugru so uniquely interesting is that it can actually be used to build, seal, and bind objects together. Twenty-four hours after it is applied, Suguru becomes an extremely durable, flexible, and waterproof silicone rubber capable of withstanding extreme weather conditions. In 2010, it was listed as one of TIME Magazine's top inventions of the year. It's not terribly well known, but it's incredibly useful. If you've never seen it, check out all it can do over here.