Week of August 10 -- 14, updated August 14. Due Friday August 14 at 11:59 PM EDT. Solutions available here.

Week of August 3 -- 7, updated August 8. Due Monday August 10 at 11:59 PM EDT. Solutions available here.

Weeks of July 20 -- 31, updated July 27. Due Saturday August 1 at 10:00 PM EDT. Solutions available here.

Week of July 13 -- 17, updated July 17. Due Wednesday July 22 at 3:30 PM EDT. Solutions available here.

Week of July 6 -- 10, updated July 6. Due Tuesday July 14 at 3:30 PM EDT. Solutions available here.

Week of June 8 -- 12, updated June 6. Due Tuesday June 16 at 3:30 PM EDT. Solutions available here, updated June 19.

Week of June 1 -- 5, updated May 30. Due Tuesday June 9 at 3:30 PM EDT. Solutions available here, updated June 19.

Week of May 25 -- 29, updated May 25. Due Tuesday June 2 at 12:00 noon EDT. Solutions available here, updated June 15.