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.

*via MathFeed on Twitter.*

# I’m going to run πkm every day in March

Inspired by the BBC’s Sport Relief fundraising campaign, I’ve decided to set myself a vaguely mathematical running challenge. My current routine does involve a little running, but nothing serious, so I’ve given myself a bar to aim for that’s both vaguely achievable, and completely irrational. I’ll aim to run π kilometres (or as close as… Read more »

# Taming the AGM

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 »

# Approaching Fermi problems with the approximate geometric mean

I gave a talk on Fermi problems and a method for approaching them using the approximate geometric mean at the Maths Jam gathering in 2017. This post is a write up of that talk with some extras added in from useful discussion afterwards. Enrico Fermi apparently had a knack for making rough estimates with very… Read more »