If you are in Cambridge, MA on Thursday, Jan. 26, you can see me live at MIT in room 3-270 from 3 to 5pm. If you are anywhere else and have Internet access, you can see me
YouTube live in the same time slot.
Here is the poster I put up 53 times on the MIT campus and 4 times at Harvard:

For those interested, here are the other four links to click on:
Quaternion Gravity intro,
http://bit.ly/vp-qgQuaternion Gravity videos,
http://bit.ly/vp-qg-videosiPython notebooks,
http://bit.ly/vp-billiards