MITxplore will again offer its Sunday Sessions this spring, for 10 weeks beginning February 21, to introduce students in Grades 4-6 to interesting and unusual topics in mathematics not covered in the standard school curriculum.  Guided by a Socratic approach, students explore and find solutions on their own.  The cost is $150, and financial aid is available.  This program fills up quickly so sign up right away.  For more information, contact mitxplore-mit@mit.edu or call 617-435-7763.  Donations to the MITxplore program are welcome.