The Mathematics Workshop in Cambridge, which offers math enrichment classes for students in Grades 1-8, has a few remaining openings this fall for Grades 4-6 on Mondays or Tuesdays, 5-6PM.  For more information, or to be on the wait-list for future classes, contact Beth O’Sullivan at bethos@alum.mit.edu.  Beth is founder of the Mathematics Workshop and a co-founder of Science Club for Girls.