### The science behind Santa Claus

Christmas is coming, and Santa will soon begin his journey. We analyse the science and maths behind his trip.### Christmas conundrum #2

Solve this and you could be the lucky winner of a signed copy of The Indisputable Existence of Santa Claus### Carnival of mathematics 152

We round up some of the last month's top mathematical posts from around the internet### Christmas conundrum #1

Solve this and you could be the lucky winner of a Chalkdust T-shirt### Chalkdust’s Christmas conundrums

As the festive season strikes again, we'll be dishing out more fiendish puzzles – this time with prizes!### Review of The Maths Behind by Colin Beveridge

Should you ask Santa for 'Ice Col' Beveridge's encyclopedic tome this festive period?### MathsJam 2017

Chalkdust descends upon the UK's largest pop maths gathering and tells you what you missed### Beghilos

When you get tired of using your calculator for numbers, why not use it for words?### Dispersion on the dark side of the moon

Maths has strong connections to art and music, but what about to both at the same time?### Closing the first Black Mathematician Month

Reflecting on what we've learnt over the past few weeks.### My mathematical trajectory

Stories and lessons on diversity in mathematics from a globe-trotting number theorist.### Read Issue 06 now!

Cardioids in coffee cups, counting with three fingers, and breakfast at Villani's.Plus the return of all your favourite fun pages.### Four things you didn’t notice in Issue 05

How many did you spot?### Star polynomials

Natalya Silcott introduces us to star polynomials!### October is Black Mathematician Month

Promoting black mathematicians, and talking about building a more representative mathematical community.### Chalkdust Issue 06 coming 19 October

Free launch party, 7.15pm. Come along!### Between a square rock and a hard pentagon: fractional polygons

A polygon with four and a half sides?!### The mathematics of brewing

While drinking beer in your favourite pub, have you ever wondered how it is produced? Find here some of the science and mathematics behind brewing.### Seeing double

Take a ball, divide it into parts, glue them back and get two identical copies of your ball!### Tupper’s self-referential formula

A hideous equation that hides beautiful images, and much (much) more besides...### Four ways Photoshop encourages thinking mathematically

How processes used in image editing are related to mathematics!### Creating hot ice

We created hot ice from scratch, a solution that remains liquid even below its freezing point!### Going once, going twice… game theory?

A quick look at how to get the most bang for your buck the next time you're in a bidding war### Review: Mathematical T-shirt

A summer essential or an embarrassment risk on the streets of Ibiza?### Winning the Chalkdust coin game

How to win a game when your expected score is 0### Crossnumber winners, Issue 05

Did you win?### How many quadratics factorise?

Write down a quadratic. What is the probability that it factorises? Paging Prof. Dirichet...### Crossnumbers and cross products

A crossnumber clue takes us plunging headfirst towards projective geometry### The mathematics of human migration

Human migration with mathematical models, data and a hands-on experiment!### Cat among the pigeons

Some interesting observations with the pigeonhole principle### Summer puzzles

Have a go at these puzzles, adequate for your holidays!### Top 10 emoji for use in mathematics

We take a look at the top 10 emojis!### Making your own papercupter

Next time you are finished using a paper cup, create your own papercupter!### What’s your least favourite number?

Read about our least favourite numbers in this collection from issue 5!### Football free-kicks… taken by Newton

Discover the mysteries behind the most spectacular free-kick ever scored and how Newton can help us to simulate it.### Taking the (mathematically) perfect picture at the Leaning Tower Of Pisa

Finding the best picture at the Leaning Tower of Pisa is all about the maths rather than the pose!### The croissant equation

Each time you eat a croissant you might be biting more than 500 layers of dough!### Review of Elastic Numbers

We have a go at the puzzles in Daniel Griller's new book### In conversation with Marcus du Sautoy

We chat to Marcus about science communication, teaching mathematics in schools, and how to make group theory sound sexy.### Thinking outside the box

Negative polygons and other mathematical creations### The pipe singularity

In the Aztec city of Atzlan, the scientist Remotep makes a revolutionary discovery### Superegg

How optimising the space around a circular monument is related to supereggs### Is it better to run or walk in the rain?

When you're caught in the rain without an umbrella... what is your best option?### Why self-service machines give such awful change

Unexpected item in bagging areAAAARGGGHH here's 90p change in pennies### Is it possible to reach absolute zero?

After 100 years, a key postulate of the third law of thermodynamics has been proven. We meet Lluis Masanes, one of the researchers responsible.### Forget a new £1 coin, we need a £1.23 coin

Not the new coin we want, but the new coin we need### Cutting my birthday cake

How to make the most slices from just a few cuts of cake### Issue 05

New issue out now! Graphical linear algebra, slide rules and game theory in nature. Plus all your favourite fun pages.### Seven things you didn’t notice in Issue 04

How many did you spot?### Chalkdust Issue 05 coming 7 March

Free launch party, 7.15pm. Come along! Free copies of Chalkdust, free pizza, and buy your own Chalkdust T-shirt.### The digital sum of the products of twin primes is 8?

What connects the products of twin primes with something you learnt in primary school and the number 8?### To share, or not to share

A tragic love story of shares and viral songs. To share, or not to share...### Should you buy a Valentine’s day present?

For those of you tackling this dilemma, here's your answer...### Curiouser and curiouser!

Some surprising mathematical facts### Two years of Chalkdust!

Here are some highlights of the first two years of Chalkdust!### Crossnumber winners, issue 04

Are you a winner?### The limit does not exist!

Lindsay Lohan is really good at L'Hôpital's rule.### Is MEDUSA the new BODMAS?

Why the infamous acronym needs revising.### Review: Mathematical socks

Can you wear them and be taken mathematically seriously?### The Indisputable Existence of Santa Claus – A review

Behind today's door... A book review!### The Chalkdust Christmas card

This year's Chalkdust puzzle Christmas card### Snowflake, the symbol of winter: different sizes, infinite shapes

Winter is coming!### The n days of Christmas

Get into the ChristMATHS spirit with the maths behind the popular Christmas carol!### Catching criminals with maths

How crime science, and the maths it uses, is helping the police fight crime### What’s your favourite set?

Here we have collected our favourite sets, from the Mandelbrot set to the Mahut-Isner set!### Visualising mathematics with 3D printing

Using modern technology to understand geometry### Feeling the love for Chalkdust T-shirts

The algebra will set your heart aflutter.### The spider witch project

Constructing a spiderweb: in the spookiest and most horrific way possible!### Hooke’s Monument

The Great Fire of London, a little-known polymath and a Monument...### Killing by numbers: the mathematics of warfare

A blast from the past. Modelling battle grounds from ancient Greece.### Issue 04 launch quiz

Tuesday 11 October, 7.15pm. Come along! Featuring hundreds of free copies of Chalkdust, free pizza, and the chance to purchase a Chalkdust T-shirt.### Man vs Maths

A review of Timothy Revell's new book, describing the hidden mathematics behind our world### Why maps are wrong

If only the Earth were flat...### The evolutionary arms race

Applying game theory to evolution### Hairy balls, cyclones and computer graphics

What can a 100-year-old result in topology say about weather and computers?### Donald in Mathmagic Land

Donald Duck learns that there is “a lot more to mathematics than two-times-two”.### Maths at EMF camp

Exploring the maths on offer at this year's UK hacker festival.### Why I hate an empty bus stop

How the queue size tells you when the next bus is coming### Mathematicians and their Gods

Believe it or not: Mathematics and Theology can coexist### Crossnumber winners, issue 03

Are you a winner?### Switching sides in a matrix equation

Looking for a neat description of this useful matrix part-inverse### Puzzles about calculus

Can you solve these puzzles about differentiation and integration?### Changing the status quo

Difficulties in designing a voting system for referenda### Tennis maths: how long should a deuce point last?

Using Markov chains to calculate some interesting tennis stats!### Constructing a sphere with 455 cups

Paper cups do not follow a hexagonal pattern and the cones do not meet at a single point, but they do make a gigantic sphere### The Housekeeper and the Professor

Memory and maths in the modern world### Stopping distances in the Highway Code are wrong

An easy equation to remember for your driving theory test, with dangerous consequences### A brief history of gravitational waves

The discovery of gravitational waves offers a new way of looking at the universe. Who knows what we will discover?### How many cups does it take to make a sphere?

The Chalkdust team set you a challenge, for which the prize is a £25 Amazon voucher...### Names for large numbers

Extending the million, billion, trillion system to much, much bigger numbers### Cracking the Guess Who? board game

Maths and Decision Theory to be the best at playing Guess Who?### The mathematics of tea-making

When-to-add-milk confusion and other related matters### Hunting for polydivisibles

The search for polydivisible numbers in different bases: how many can you find?### Carnival of Mathematics 133

This month's round up of mathematical blog posts.### Are we getting tired of Twitter?

Here is the reason why the golden era of Twitter is gone### The wonders of mathematical crochet

Hyperbolic surfaces, Klein bottles and more### What’s your favourite shape?

Read ours then send us your favourites!### Issue 03 launch quiz

How many points could you have scored at our launch quiz?### Fun with water bells

Explaining how surface tension makes water form surprising shapes### Chalkdust Issue 3 coming soon! 14/03/16

Your first peek at our Spring issue### A counterintuitive result in the theory of traffic flow

Additional roads do not imply faster travel times!### Dear Dirichlet Valentine’s Day special

Agony uncle Professor Dirichlet answers your personal problems this Valentine's Day.### How to make: a Dear Dirichlet Valentine’s Day card

Make the perfect gift for your loved one### Finding the edge of your images

How can we identify objects in photos, to diagnose cancer or predict the weather? Using gradients!### The analytics of healthcare

Simple Statistics can help businesses make informed decisions### How to tile a chessboard

Introducing polyominoes### New largest prime number discovered!

Amaze your friends with our top facts about the new largest known prime number### The Drake equation

Is there life on Mars? Or anywhere else?### Victorian maths tricks with old money

Exploring mental arithmetic tricks in T. Martin's 1842 guide, 'Pounds, shillings and pence'### Chalkdust review of the year 2015

Have you read the best of the blog?### Christmas puzzles

Something for you to solve during the post-Christmas lull### Dear Dirichlet Christmas special

Agony uncle Professor Dirichlet answers your personal problems this Christmastime.### Crossnumber winners

Are you a winner?### How to make: Christmas Special

Making gingerbread Platonic solids, Fröbel stars and Christmas flexagons### What’s your favourite function? Part II

We have received loads of feedback from people telling us their favourite function### 100 years with the Sierpinski triangle

Three ways to obtain and generalise a beautiful fractal### Weekend at MathsJam

Chalkdust visits popular maths' biggest conference### @mathslogicbot

Explaining the tautological Twitter bot### Our Favourite Functions: Part I

Because we love functions!### How to kick a conversion

Where should you choose to take a conversion kick from?### Somewhere over the rainbow

Some mathematical questions you might have wondered every time you look at one of those rainbows### How much will I win on the new National Lottery?

What difference will an extra 10 balls make?### Why is it so hard to pull two phone books apart?

Take two phone books and interleave all their pages one by one. Now try and pull them apart by their spines. Impossible, right?### Chalkdust Issue 2 coming soon! 06/10/15

Find out what's going to be inside### Number Rumbler–a new fun maths game!

Maths on Toast is a charity that aims to challenge and change the public's perception of mathematics...### Our Favourite Blogs

A selection of our favourite mathematical blogs### Can you solve these puzzles?

While we work on issue 2### Time turns backwards at the Spark Festival

The extreme weirdness of slow viscous flows, and why borrowers shouldn't use doggy paddle.### Introducing the Cuboku

Can you solve our 3D Sudoku puzzles?### Is there a perfect maths font?

Let's print your thesis in Comic Sans### Do you have too many or too few friends?

Do we have a natural limitation on the number of friends that we have?### Crossnumber winners

Are you a winner?### Thoughts on the crossnumber

Did you use meta-logic to solve the crossnumber?### Puzzles on square grids

How to make Sudoku more interesting### Pandigital square numbers

Why are there none in base 13?### Will the Universe actually end in a big rip?

What the Guardian got wrong...### Ace

How tennis players spin and slice their serves### What’s your favourite number?

Favourite numbers for many are linked to birthdays or anniversaries, but here is our take on the question### Maths for money: The Longitude Prize

When people do science for money…### What makes a good puzzle?

If you enjoyed Hannah's sweets then you'll love these...### Can we do good more effectively?

Choosing which charity we donate money to shouldn't be an entirely emotional decision.### Review of Birth of a Theorem

Cédric Villani’s Birth of a Theorem tells the story of a mathematical theorem### The statistics of a squeaky bum

Does form going into the play-offs predict your success?### For the love of puzzles

Pub ✕ maths = ?### Politics: a tweeting glance

What does Twitter have to do with politics?### Introducing the Chalkdust blog

We have some fantastic blog articles, and this is how we plan to publish them.