# πkm Running Challenge: 7-day update

Katie’s running πkm per day for charity, every day in March. Seven days in, here’s how she’s getting on.

# Carnival of Mathematics 155

The next issue of the Carnival of Mathematics, rounding up blog posts from the month of February, and compiled by Ben, is now online at Math Off The Grid.

The Carnival rounds up maths blog posts from all over the internet, including some from our own Aperiodical. See our Carnival of Mathematics page for more information.

# Prime Time

Having seen a mathematical claim in the paper, Katie has found it to be correct (for a change) and dug into what else it implies.

# Stanisław Ulam biopic

There's going to be a biopic of physicist/mathematician Stanisław Ulam, titled Adventures of a Mathematician﻿.

Hollywood seems to be working its way through 20th century mathematicians – off the top of my head, there have recently been biopics of John Nash, Alan Turing, Stephen Hawking and Srinivasa Ramanujan. What I want to know is, when do we get Michael Sheen playing John Horton Conway?

There's some information about Adventures of a Mathematician, starring Jakub Gierszal as Ulam, at ScreenDaily.

This post is in response to Peter’s post introducing the Approximate Geometric Mean. The approximate geometric mean $\mathrm{(AGM)}$ is a nice approximation of the geometric mean $\mathrm{(GM)}$, but it has some quirks as we will see. After a discussion at the MathsJam gathering, I was intrigued to find out how good an approximation it is…. Read more »