**Future Train Wreck: Mine or Modern Physics talk Next Thursday, Jan. 26**

If you are in Cambridge, MA on Thursday, Jan. 26, you can see me live at MIT in room 3-270 from...

**Holiday Physics Card, 2016**

Just put them in the mail on December 24...It was a fun year of thinking, whether the idea is right...

**Unified Mathematical Field Theory Talk**

I gave a 15 minute talk at a local Americal Physical Society Meeting. Here is the title and...

**Holiday Card 2015**

Here is my holiday card for 2015, a tradition of mine going back to 1990. Enjoy.On the back...

For those part-timers who wish to move beyond the "Brief History of Time" level of physics, this is an obvious thing to try and figure out. Because gravity does not work instantaneously, there is a wee bit more wobble in the orbit of Mercury. This blog hopes to provide all the detail needed.

March 20, A Toy Model For Q

_{8}

**Snarky puzzle**

What is required so that a system undergoing change can be described just as accurately by the group Z_{4}as by Q_{8}?

**Background**

The funny thing I realized by building a pipe cleaner model of

*Q*is that is too complicated. There must be a simplifying principle out there...

_{8}**Answer**

*Q*, which over the real numbers becomes the quaternions. David pointed out my tetrahedron was half the cube it needed to be to represent

_{8}*Q*. That was the idea for the blog: make a cube to represent that finite group.

_{8}