BusinessTeens start up startupsTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoBusinessGrit Hofmann12/22/2016December 22, 2016Rubin Lind is just 17 years old. He has developed an app that allows students to use their smartphones to study on the go. He launched his company four weeks ago. https://p.dw.com/p/2UhkPAdvertisement