### This Week’s Finds in Mathematical Physics (Week 270)

#### Posted by John Baez

In week270 of This Week’s Finds, see lava flowing on Jupiter’s moon Io.

Hear about Greg
Egan’s brand new novel, *Incandescence*. Then - see talks about
my favorite three numbers. Read about the Mathieu group M_{12}.
Learn how each regular polytope with 5-fold rotational symmetry is
secretly linked to a lattice in a space of twice as many dimensions.
And see a simple but surprising property of the number 12.

## Connes-Egan; Re: This Week’s Finds in Mathematical Physics (Week 270)

Week 270 = 2 * 3^3 * 5 is delightful. Even through the stench of brimstone…

Suppose that physical space is actually a noncommutative geometry. What primitive aliens in an exotic environment could figure that out? I await the Connes-Egan collaboration…