To celebrate Educator Month, the EcoTarium (222 Harrington Way in Worcester) is offering free admission and free planetarium shows to teachers (and an accompanying friend) throughout November.  Teachers and their friends are also invited to the EcoTarium’s November Social Science evening event — after hours and child-free — on November 17, 5:30-7:30.  And field trips booked in November for November or January will have group admission charges discounted by 50%.  New education programs include Build Your World (Grades preK-3), The Art of Science Observation (Grades K-2, 3-5, 6-8, 9-12), City Hot Zones (Grades 3-5, 6-8, 9-12), and Asteroid: Mission Extreme (Grades 3-5, 6-8, 9-12).