Registration is now open for the next monthly Saturday-morning session Science on Saturday, on May 16 at MIT’s Lincoln Laboratory (244 Wood Street in Lexington).   The topic will be Hands-On Engineering, presented by members of the Lincoln Laboratory Technical Women’s Network (LLTWN).  Students engage in activities to paint using pitch and frequency of sounds, watch demonstrations of 3D printers, and simulate missile launches.  All children must be escorted by an adult, and every adult must be escorted by a child or children.  Admission is free but each person attending must be registered.  Space is limited, so register online soon for either Session 1 (9AM to 10:30AM) or Session 2: 10:45AM to 12:15PM).  Adults much bring government photo identification.  See other rules on the registration pages.