twitter-bootstrap Using Clearfix in Rows and Cols
Introduction
When creating advanced layouts, there may be scenarios when you'll need to use more than 12 column units in a single .row element. The concept of column wrapping and responsive resets (A.K.A. clearfixes) are essential to understanding responsive design with Bootstrap.
Remarks
Bootstraps grids are remarkably powerful and elegant. However, you must remember that the name of the framework is "Bootstrap", not "WeDidItForYou". Bootstrap enables responsive design, it does not guarantee it.
It is still up to you to make your design truly responsive, and give your users the best possible end-user experience.
