The Newton Free Library is offering a course, Linux for Teens, on Wednesdays (October 14, 21, 28; November 4, 18) at 7PM in the third-floor Rear Arc.  Students in grades 6-12 are welcome to this introduction to the GNU/Linux operating system, covering the UNIX  shell, creating  a document, networking, email and  encryption, operating  system components  (memory  management,  the  file  system, devices, the kernel), etc. The class will also address the “free software” philosophy, privacy and data security concerns, and ways to protect personal data and other sensitive information.  Space is limited. Register online.