genius is seeing what everyone else sees, and thinking what no one else has to solve a common problem

Because every damn presta valve has annoyed us at one time or another when we needed to inflate it, and it's this simple to use the dust cap to adapt a presta to a standard valve

Found on http://www.bikehacks.com/bikehacks/2014/01/the-most-amazing-presta-valve-adapter-ever.html