# From the blog

• ### Book of the Year 2020

We announce the winner of this coveted prize
• ### The Wonder Book of Geometry

We review the seventh of this year's nominees for the Book of the Year, and open the vote for the readers' favourite
• ### Hello Numbers! What Can You Do?

We review the sixth of this year's nominees for the Book of the Year
• ### Why Study Mathematics?

We review the fifth of this year's nominees for the Book of the Year
• ### Molly and the Mathematical Mystery

We review the fourth of this year's nominees for the Book of the Year
• ### How to Make the World Add Up

We review the third of this year's nominees for the Book of the Year
• ### Geometry Juniors

We review the second of this year's nominees for the Book of the Year

We review the first of this year's nominees for the Book of the Year
• ### Chalkdust Book of the Year 2020

We announce the shortlist
• ### 7 ways to tell if a number is divisible by 7

Łukasz takes us on a tour through a surprisingly diverse range of algorithms to test for divisibility by 7
• ### Christmas puzzles: the solutions

We reveal the solutions to our Christmas puzzles!
• ### Christmas puzzle #3: Colouring by numbers

Puzzle #3 in our 2020 Christmas puzzle series
• ### Christmas puzzle #2: A Christmas nonogram

Puzzle #2 in our 2020 Christmas puzzle series
• ### Christmas puzzle #1: Christmas tree sudoku

Puzzle #1 in our 2020 Christmas puzzle series
• ### Revisiting the 1986 computer classic Number Munchers!

Belgin gets hooked on a classic maths game...in 16 bits! Here's her review...
• ### Flo-maps fractograms: the game

Try out these flo-maps for yourself: fractions speak louder than words
• ### Flo-maps fractograms: the prequel

Hugh Duncan returns with the long-awaited prequel in which he further explores the geometric patterns hidden behind the fractions.
• ### Rewatch the Issue 12 virtual launch event

Now available to catch up on YouTube
• ### Crossnumber winners, issue 11

Did you solve it?
• ### Chalkdust issue 11 – Coming 17 April

Issue 11 of everyone's favourite magazine for the mathematically curious is coming very soon
• ### Crossnumber winners, issue 10

Did you solve it?
• ### On curvature: cars, clothoids and cartography

Issah Merchant discusses the geometric principles behind, and real-world applications of, curvature
• ### Book of the Year 2019

We announce the winner of this coveted prize
• ### The Hidden Half

We review the ninth of this year's nominees for the Book of the Year
• ### Maths on the Back of an Envelope

We review the eighth of this year's nominees for the Book of the Year
• ### The Maths of Life and Death

We review the sevnth of this year's nominees for the Book of the Year
• ### Humble Pi

We review the sixth of this year's nominees for the Book of the Year
• ### So You Think You’ve Got Problems?

We review the fifth of this year's nominees for the Book of the Year
• ### Here Come the Numbers

We review the fourth of this year's nominees for the Book of the Year
• ### The Art of Logic

We review the third of this year's nominees for the Book of the Year
• ### A Compendium of Mathematical Methods

We review the second of this year's nominees for the Book of the Year
• ### Geometry Puzzles in Felt Tip

We review the first of this year's nominees for the Book of the Year
• ### Chalkdust Book of the Year 2019

We reveal the shortlist
• ### Constructing the cover of Issue 10

21 simple steps to draw your own Islamic pattern!

• ### Chalkdust issue 10 – Coming 24 October

Come along to our launch party for free pizza and the real quiz
• ### Black mathematician month 2019

A month celebrating the contributions of black mathematicians
• ### Crossnumber winners, issue 09

Did you solve it?
• ### Reproduce or die

Hugh Duncan explores an exciting variation on Conway's Game of Life
• ### Review of Problem Solving in GCSE Mathematics

We have a go at the puzzles in Daniel Griller’s new book
• ### How do calculators do trigonometry?

W.L. Feldhusen explains the obscure sine-finding trick hiding inside your calculator!
• ### Counting all the numbers between zero and one

Tony Pisculli dissects the lyrics from a popular song
• ### Unknown pleasures: pulsars and the first data revolution

The scientific story behind the cover of Joy Division's treasured debut
• ### The scutoid: a geometric building block of life

In 2018, scientists discovered a new shape that is essential to multicellular life

• ### Review: Mathematical socks 2

More sartorial inquisition for your feet
• ### Chalkdust issue 09 – coming 15 March

Read the magazine, and come to the launch party!
• ### Talkdust, episode 3

A podcast for the mathematically curious
• ### Piet Hein: the pirate

Did the Danish mathematician also sail the high seas?
• ### Crossnumber winners, Issue 08

Did you solve it?

Tricks and puzzles that provide an introduction to the world of partitions
• ### Talkdust, episode 2

A podcast for the mathematically curious
• ### The sieve of Eratosthenes: revisited

How can we teach people about the sieve in a way that helps them best understand prime numbers?
• ### An irrational problem

Investigating the power of thinking rationally
• ### Solutions to recent puzzles

Looking back at puzzles about complex numbers, tic-tac-toe, and the Eggnog Mystery
• ### Christmas competition #3: ‘An eggnog mystery’

Lies, liquor and logical deduction play their part in this festive holiday tale
• ### Christmas lights, trees and maths

Why do Christmas lights get tangled? And what's the perfect way to decorate a Christmas tree? Find the answers here.
• ### Christmas competition #2: ‘More geometry snacks’

Win this year's best book of geometry puzzles
• ### The first Black Mathematician Month outreach event

Looking back at the exciting day that closed our 2018 celebrations
• ### Christmas competition #1: ‘You can’t polish a nerd’

Win a DVD boxset from Festival of the spoken nerd in our first Christmas competition!
• ### Deal or no deal?

Mike Fletcher explores the optimal strategy for winning the popular television game show
• ### Digging for roots in the complex plane

Bring your shovel, and dig with us to unearth some amazing results about polynomials
• ### Talkdust, episode 1

A podcast for the mathematically curious
• ### Overturned polygons: shapes with less than two sides

Hugh Duncan explores polygons with a shortage of edges
• ### The history of pi

What is pi? How do we define it and who first thought of it? We explore the history of this quintessential mathematical constant.
• ### Mathscon: reshaping the world’s perception of mathematics

Introducing Mathscon, a mathematics conference with a difference!
• ### The maths ‘black box’

John Pougué Biyong explains how and why science communication can lead to better diversity.
• ### Balancing the equation

Reviewing the Royal Institution's first Black History Month event.
• ### The mathematics of Black Panther

Nira Chamberlain explains how Black Panther's suit can be modelled mathematically
• ### David Blackwell and me

Clive Fraser reflects on his interactions with one of the greatest ever Black mathematicians
• ### Carnival of Mathematics 162

This month’s round up of mathematical blog posts from all over the internet
• ### Black Mathematician Month 2018

We look back at last year's Black Mathematician Month, and give a preview of what to expect this October.
• ### Eight things you didn’t notice in Issue 07

You'll never believe number 3!

• ### Can you make something out of nothing?

We explore the concept of emptiness in set theory, and explain how zero went from "nothing" to "something"
• ### 2018 Fields medal winners

Introducing the work that has won mathematics' most famous award
• ### Complex numbers and algebra

Exploring the beauty of complex numbers, their origins and why they are important
• ### Folding nets into Johnson solids

How does one produce a net for the broadest class of polyhedra?
• ### My life with mathematical tattoos

... and how Chalkdust played a role in one of them
• ### Crossnumber winners, Issue 07

Did you solve it?
• ### Frawks

Exploring non-random walks using fractions
• ### Closing the Gap

A review of Vicky Neale's new book about the quest to understand prime numbers.
• ### The maths behind a chip goal

We analyse the maths and physics required to execute a good chip shot
• ### Bend it like Newton: curves in football

Discover the mathematical equations that describe the most commonly observed trajectories in football

An unexpected way to beat the odds in this classic game
• ### Integration: It’s more than the sum of its parts

Defining what exactly an integral is leads naturally to an explanation of how to handle approximating them.
• ### Fun phenomena in fluids

A selection of weird goings-on from the world of fluid mechanics
• ### Review of Galois Knot Theory

A thrilling review of this truly enlightening book
• ### Modelling blood

Blood is exceptionally complicated and its composition varies from person to person. So how do we begin to model it?
• ### Maths trumps review

A mathematically-themed version of the classic card game, with several new features
• ### Our favourite (and not-so-favourite) Euler equations

A collection of our favourite and least favourite things named after Euler, from issue 07
• ### The new Chalkdust T-shirt

Have you been wondering what the pattern on it means?
• ### A few of Euler’s masterpieces

Read Euler, read Euler, he is the master of us all." -- Laplace. An invitation to join us in celebrating Euler's 311th birthday by appreciating a few of his great contributions to mathematics.
• ### Let them share cake

Or, how a simple problem can get very complicated, very quickly...
• ### Magic behind the Fibonacci sequence

Let's take a look at patterns that can be discovered in Fibonacci numbers and how we can find them around us.
• ### Ten things you didn’t notice in Issue 06

You won't believe number 5!
• ### Sylvester’s convex hull problem in R

What is the probability that d+2 random points in d-dimensional space form a convex body? Investigating an old problem using modern methods.

• ### Power-up review

"Unlocking the hidden mathematics in video games"
• ### Modelling in a heartbeat

Learn how to model your heart one beat at a time ❤️
• ### Math Blaster

Belgin plays a classic mathsy game from her childhood...in 16-bit graphics! Here's her review...
• ### Why knot?

You can un-knot a knot, by cutting it not?
• ### Surname extinction

Why do surnames die out? We take a look at the Galton-Watson process for modelling the extinction of surnames to answer the question: 'When will we all be Smiths?'
• ### Crossnumber winners, Issue 06

Did you solve it?
• ### Well, well, well…

A fiendish puzzle for you to 'pour' over...
• ### The mathematical con artist

Some summations seem strangely slippery...
• ### Maths and music, together in harmony

Uniting the teaching of mathematics and music can benefit pupils greatly in both areas.
• ### Review of the year 2017

What have we been up to this year?
• ### Solution to Christmas conundrum #4

... and the winners
• ### Christmas conundrum #4

Can you solve four puzzles to reveal the hidden message?
• ### Review of The Element in the Room

Reviewing this week's conundrum prize... science-y stuff staring you in the face!
• ### Christmas conundrum #3

Try our nonograms! And remember, not all puzzles have a unique solution...
• ### 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.
• ### Issue 06

Cardioids in coffee cups, counting with three fingers, and breakfast at Villani's. Plus the return of all your favourite fun pages in our autumn 2017 issue.
• ### 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

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

• ### 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

Graphical linear algebra, slide rules and game theory in nature. Plus all your favourite fun pages in our spring 2017 issue.
• ### 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...

• ### 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

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

• ### 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

• ### 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

• ### 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

• ### 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.