ProjectCSGIRLS is a non-profit aiming to address the gender gap in computer science through workshops and a national competition. ProjectCSGIRLS and Yahoo will host a free computer-science workshop for middle-school girls on February 18, 10AM-2PM at Yahoo’s Boston office (31 St. James Avenue, Suite 11A, Boston), to kick off a national competition in using computer science to address an imminent social problem.  Workshop sessions will include web development, social impact and design thinking, mobile app ddevelopment, game programming, presentation by Yahoo Engineers, ‘Women in Tech’ panel, robotics, and bioengineering. Registration for the workshop is first-come/first-served. Individuals and teams may also register for the competition by February 20., and projects are due April 15.