This week on World Stories, we see how giving away water filters in Kenya can make money and save the environment, we visit a young Bulgarian who's collected a library of English books and we learn about the success of a helicopter producer in Mexico. We also meet a Saudi author of satirical stories and see how education is combating extremism in Pakistan.<br />For more information and videos go to:<br />http://www.dw.de/english<br />http://www.dw.de/program/world-stories/s-30419-9798
