Harry and the Potters perform on stage at Harvard University July 20. A crowd estimated between 10,000 and 15,000 people gathered at Tercentenary Theatre just before the release of Harry Potter and the Deathly Hallows.

Harry and the Potters perform on stage at Harvard University July 20. A crowd estimated between 10,000 and 15,000 people gathered at Tercentenary Theatre just before the release of Harry Potter and the Deathly Hallows.

Fans dressed as characters from Harry Potter swarm Harvard Square the night of the release of the seventh and final book of the series. The woman on the left is dressed as the Fat Lady, a talking painting that guards the entrance to Gryffindor Tower, complete with a frame to reside in.

MIT Police Chief John DiFava has been promoted to the head of the Operations and Security division of the Department of Facilities. Facilities was split into two divisions, which also includes Capital Projects and Strategic Planning, on Nov. 5.

Building W1 will undergo a complete renovation before it reopens as an undergraduate dormitory in the fall of 2010.

Sunita Darbe ’09, Christopher J. Varenhorst ’09, Danbee Kim ’09, and C. Kiersten Pollard ’09 (left to right) examine the newly-revealed rings after the Class of 2009 Ring Premiere.

During team Groovytron’s dance-off on Sunday in Lobby 34, a team member spins a Hula Hoop around his foot while lying on the floor. Several teams participated in the dance-off that provided a break from this year’s Mystery Hunt.

As one of the puzzles in the Mystery Hunt, this FM transmitter was hidden above the doors to Lobby 7. It repeatedly transmitted the word “needlepoint” to teams who figured out that the solution required them to take an FM radio to Lobby 7 and tune it to the correct frequency.

As a break from the toiling of this year’s Mystery Hunt, team Groovytron hosted a dance-off on Sunday at 6:30 a.m. in Lobby 34.

MIT hackers abide by a written code of ethics that is painted on the wall of an MIT basement.