Registration is now open for two Saturday-morning sessions of Science on Saturday, on February 6 at MIT’s Lincoln Laboratory (244 Wood Street in Lexington).   The topic will be Cryogenics & Liquid Nitrogen, presented by Lincoln Laboratory’s  Dr. Richard Williamson.  All children (5-17 years) must be escorted by an adult, and every adult must be escorted by a child or children.  Children under 5 are not admitted.  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 must bring government photo identification.  See other rules on the registration pages.