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October 2018

Simple Feed Ranking Algorithm

How to efficiently order lists based on popularity and recency.

Serial and Parallel bulb puzzle

How to connect two bulbs in series or parallel with a switch.

Slot Machines

The psychology of why people love to play slot machines.

September 2018

Overlapping Disks

What is the relationship between the percentage overlap during an eclipse, and the separation of the objects?

Human Fuel Consumption

How many miles to the gallon does a person get?

August 2018

Probability and Tennis

Based on your skill, what is the probability of winning a tennis match?

July 2018

Grazing and Calculus Revisited

Revisiting the optimal grazing field size using a barn and straight section fencing.

Verlet Simulations

Simple physics simulations of cloth and rag-dolls based on Verlet Integration.

Poor Customer Service

Why do companies not understand how poor customer service, whilst seemingly advantageous in the short term, is damaging in the long term?

June 2018

Lucy`s Secret Number puzzle

How can you determine Lucy`s secret number when you only overhear part of her conversation?

May 2018

Six Dice Betting Game

What are the chances that rolling six dice will result in four distinct numbers?

How digital cameras work

And the clever math that turns their color-blind sensors into full color images (plus some bonus calculus and interpolation).

April 2018

How analog TV worked

The clever technology around how analog TV protocols were created, and why there was an odd number of lines on an old TV screen.

March 2018

Turning Water into Wine

How to turn water into wine (with and without recursion). Calculating Levenshtein distances.

Sock Puzzle Revisited

What is the probability of pulling out matching pairs of socks from a drawer in darkness?

Compound interest and retirement

Why it is critically important to start saving for your retirement as soon as possible.

Nine digits puzzle

Arrange the digits 1-9 to make a nine digit number such that the first digit is divisible by one, the first two divisible by two, first three divisible by three …

Mathematics of Tape Recorders

The mathematics of tape machines, cassettes, and toilet rolls.

February 2018

Cribbage Scores

What is the distribution of all possible cribbage scores? (And what is the connection between Cribbage and nuclear submarines?)

Kolmogorov and randomness

What does it mean to be random?

Pancake Numbers

A classic problem involving the optimal way to flip a stack of pancakes into sorted order using just a spatula (prefix reversal). A young Bill Gates co-wrote a paper on this, and his upper bound solution was the best known solution for almost 30 years!

Linus Sequence

A mathematical sequence named after a famous Peanuts cartoon character.

Superbowl Helmet Puzzle

A quick geometry puzzle for a shape that looks (a little) like a football helmet.

Moravec's Paradox

Predicting the future is a crap shoot and, ironically, what appears to be hard is easy, and what appears easy, is really hard.

January 2018

Shortest Crease Problem

A classic problem about how to calculate the shortest crease by folding the corner of a piece of paper (and how most calculus text books get this wrong).

CES 2018

Notes from the show this year.

December 2017

Linked Lists

The basics of linked lists.

November 2017

Incremental means and variances

How to keep a rolling track of the average and standard deviation of a stream of numbers, without having to reprocess the entire set, and minimize the chance of precision loss.

Linear Feedback Shift Registers

Incredibly useful, and efficient, ways to cycle through a range of values.

October 2017

Multi Armed Bandit

What strategy should you employ when faced with a series of parallel experiments that have unknown outcomes?

August 2017

Poor Customer Support?

GoDaddy took one of my websites offline for six months, and only offered compensation of one month of future hosting costs if I were to renew!

The jet plane that shot itself down

The unfortunate incident of the plane that shot itself down.

Van der Waerden numbers

Colouring sets so there are limited arithmetic progressions.

June 2017

Hexagon Geometry Puzzle

What is the area of the shaded quadrilateral?

Wind Turbine Efficiency

How much energy can we extract from wind?

May 2017

Voronoi Soccer

Who is nearest the ball?

Voronoi Diagrams

Mapping nearest locations.

April 2017

Alphabear Solver

Tool to help solve difficult Alphabear puzzles.

Cake cutting part 3

Episode three of cutting a cake into eight pieces.

Cake cutting part 2

Revisiting the best way to cut a cake into eight equal sized pieces.

Cake cutting

What's the best way to cut a cake into eight equal sized pieces?

March 2017

Three Bag Logic Puzzle

How to determine the contents of a treat bag with a single question.

Cryptogram Puzzle

A cryptogram puzzle using the digits 1-9.

Vestigial trigonometry functions

Trig functions that were popular 30+ years ago, but are rarely mentioned these days.

NSA Easter Egg Puzzle

A puzzle to determine the better strategy to hunt for Easter Eggs in sealed boxes.

February 2017

Interactive Hangman Solver

Online interactive hangman solver.

The Price is Right

What is the optimal strategy for playing the Big Wheel?

Crazy Progress Bars

Why do time estimates on progress bars sometimes go crazy?

January 2017

Radiocarbon dating

How does Carbon-14 dating work?

Centroids of semicircles and hemispheres

How to calculate the centroid of a semicircle, and how this is different from a hemisphere.

Self Driving Cars

Will self-driving cars enable jerks? Will laws have to change?

CES 2017

Notes and thoughts from my visit to CES 2017.

Painted Cube Puzzle

A classic puzzle involving cutting a painted cube into smaller cubes.


Analysis of the odds on this classic casino game.

December 2016

Optimal House Shape

Mathematically, what is the optimal pitch for a roof?

Think slow, think fast

Two simple math problems to which the first answer you give might not be correct.

Freudenstein's Equation

Deriving a formula for the wheel angles in Ackerman steering.

Ackerman Steering

How, and why, the front wheels of your car turn at different rates.

November 2016

Grazing in a circular field

How long a rope do you need to allow a goat to graze half a circular field, if it is tethered to the circumference?

Lost Car Key Puzzle

Bayesian analysis of lost car keys.

Tangent Length Puzzle

Coffee time challenge: What is the length of this tangent?

Aligned Clock Hands

How many times a day do the Hour, Minute, and Seconds hands of an analog watch align perfectly?

October 2016

6 years and 250 Articles

I've been a blogger for six years and written 250 articles.

Einstein's Spacetime

What is the real explanation of gravity?

Multiple Raffle Strategy

Should you put all your tickets in one drawing, or spread them out evenly?

Champagne Bottles

What are the different sizes of Champagne bottles?

September 2016

Poker odds with wild cards

How do poker odds change with the addition of wild cards?

Poker Odds

What is the relationship between the chances of a poker hand occuring and its rank?

Wire Gauges

Why do wire gauge numbers go up as wires get thinner?

August 2016

Lagrange Points

Orbital mechanics, and Lagrange Points (things most physics text books get wrong).

Moscow Math Olympiad Puzzle

How can you and a friend publicly communicate about cards you are holding without a third person knowing?

Balanced Field Length

What is your best strategy if your plane experiences an engine failure during take-off?

July 2016

Efficient Guttering

What is the optimal way to bend a flat sheet to make an efficient gutter?

June 2016

How things float

What orientation will a square log float in water?

Matter and Neutron Stars

What happens when you compress the space that is inside atoms?

May 2016

Blending independent estimates

How should you combine two independent estimates of age (with different Variances)?

Piano Keyboards

Why are the black and white keys of a piano spaced the way they are?

Bisecting an arbitrary triangular cake

An extension of the cake cutting puzzle from last week.

Bisecting a triangular cake

What is shortest cut on a triangular cake to make two equal sized pieces?

April 2016

Baseball Card Collecting

On average, how many baseball cards do you need to buy to ensure you get a complete set?

Eiffel Tower

Is it true that the air around The Eiffel Tower weighs more than the tower?

Solar Eclipses

What's the difference between a total and an annular solar eclipse?

March 2016

How tall is that tree?

How can you determine the height of a tree without chopping it down?

Two Bingo Ball Puzzle

If you draw two balls 1-75 and keep the highest one, what is the expected value?

National Pi Day

Finding digits in Pi that correspond to their position.

Grazing and Calculus

What is the optimal shape for a rectangular grazing paddock?

February 2016

Two nugget problem

How do you determine the two heaviest nuggets (out of sixteen) in the least amount of weighings?

d20 stopping puzzle

Roll a d20, and collect the value value shown, or pay to roll again?

Russian Roulette

How do the odds of this game change with more chambered rounds?

Six Roll Dice Game

What is the optimal strategy for playing a simple dice rolling game?

January 2016

Hamming Codes

Detecting (and correcting) errors in digital signals.

Defective Circuit Board Puzzle

I have ten circuit boards, and I know exactly two are bad.

CES 2016

Consumer Electronics Show 2016.

Koch Snowflake

Generating snowflakes using recursion.

December 2015

Tricky Geometry

The World's hardest, easy, geometry puzzle?

Weird Number Bases

Will future digital computers move away from binary?

Estimating known unknowns

Can you estimate the number of unfound errors in a document by comparing two independant analyses?

November 2015


Generating mazes with back track recursion.

Golf Balls

How much does the addition of dimples adjust the Volume and Surface Area of golf balls?

October 2015

Cutting a semi-circle

Geometry puzzle about dividing a semi-circle into three.

Go easy on Volkswagen

Yes VW screwed up, but cut them a little slack.

Generating Fibonacci Numbers

What is the best programatic way to generate Fibonacci numbers?

Lychrel Numbers

What is the longest known delayed palindrome?

September 2015

Gravity Variations

How much does your weight vary as you move around our planet, and why?

Business Execution

Ideas are cheap. It's all about the execution.

Twenty Peg Puzzle

How do you determine if four points make a square?

Becoming an adult

At what age, legally, do you become an adult?

Langton's Ant

Simple cellular automatons.

Anti Counterfeit Measures

Interesting patterns printed on most banknotes to deter counterfeiting.

August 2015

Telephone Keypad Design

Why are the push buttons on a telephone arranged the way they are?

Chicken nugget numbers

Chicken nugget numbers, and how to make optimal change.

Carnival of Mathematics #125

Carnival of Mathematics blog-roll, episode 125.

July 2015

Congruent Rectangles Puzzle (trig solution)

A trigonometric solution to last weeks geometry puzzle.

Congruent Rectangles in a Square Puzzle

A geometry puzzle that, at first glance, appears to have not enough information to solve.

ROT13 and Caeser Ciphers

Obfuscation of text by shifting characters and simple substitution ciphers.

Fan Direction

If you are trying to cool down a room with a fan, is it better to suck or blow air?

Seattle Space Needle Climb

I'm climbing the Seattle Space Needle to raise money for cancer research.

Roulette Wheel

Why are the numbers on a roulette wheel distributed the way they are?

June 2015

Carnival of Mathematics

I will be hosting the August 2015 edition of the Carnival. Do you have any interesting facts about the number 125 you'd like me to share?

Standard Deviation Puzzle

What number can you add to the set {1,2,3} so that the standard deviation remains the same?

The Pardoner's Puzzle

Can you connect sixty-four towns with eight straight lines, and what is the connection with Harry Potter?

Five Circles Puzzle

Is it possible to draw five circles over a grid of 5x5 points so that at least one circle passes through every point?

May 2015

Buffon's Needle

Calculating Pi by dropping needles onto a floor covered by parallel lines.

Poincaré conjecture

A million dollar math puzzle, and some pretty pictures.

Clover Leaf Geometry Puzzle

What is the area of the region formed by the overlap of four semi-circles in a square?

The geometry of running tracks

Why are running tracks oval in shape, and why do runners start from staggered positions?

April 2015

Geometry Puzzle (alternative solution using trigonometry)

An alternative solution to the puzzle from last week solved using trigonometry.

Geometry Puzzle: Inscribed rectangles and equilateral triangles

What are the dimensions of an inscribed rectangle that has the same area as an inscribed equilateral triangle?

Deepwater Horizon Tragedy

How deep was the Deepwater Horizon drill when the accident happened?

How much money do bloggers make?

An honest disclosure of the money I make from blogging? Is it possible to make a full time living from just blogging?

Can you save money by refuelling when it is colder out?

Is it better to purchase gas when it is cold outside? How much difference does the temperature make to the volume of gasoline pumped?

Lissajou curves - pretty pictures from sine waves

Pretty pictures generated from the orthogonal combination of sine waves of different frequencies and phase.

Rich Boy Learns Anagrams

Three tools to help with the solving and generation of anagram puzzles.

March 2015

Looking for PINs in PI

How many digits of Pi do you need to ensure all possible 10,000 four digit PINs are included?

Simpson's Paradox

The counter intuitive way that statistical results appear to reverse when lurking variables are ignored.


How the manipulation of boundaries can adjust voting outcomes.

January 2015

What is the optimal shape for a bucket?

Mathematically, what is the optimal shape to make a bucket so that it holds the greatest amout of fluid for the amount of material used?

Consumer Electronics Show 2015

Notes from my annual pilgrimage to the Consumer Electronics Show.

Deal or No Deal?

Is there a correct strategy for playing Deal-or-no-deal, and what does this teach us about risk tolerance?

December 2014

Classic 100 Prisoner Escape puzzle

One hundred prisoners and one hundred boxes. They can all be set free if they are able to find their own numbers.

Dealer Button Bias

If you select a dealer by the first person to receive an ace, how biased is this?

How much does a cloud weigh?

How much do clouds weigh, or do they float weightless?

Prison escape puzzle involving a chessboard and coins

Using binary mathematics to solve, what seems like, an impossible puzzle. Is it possible to encode six bits of infomration with the flip of a single coin?

November 2014

Good and bad shuffling algorithms

Have you been writing bad shuffling code your entire life?

Gray Coded Binary

Gray codes (also know as Reflected Binary Codes). Why are they so useful?

If every iPad was combined into one giant device, what would it look like?

Apple have sold over 225 Million iPads. If these were combined into a single device, how big would it be?

Minimizing cross bracing in rectangular grids

What is the minimum number of cross-braces needed to make a rectangular grid stable?

October 2014

Red/Black gambling game: Drawing cards from a shuffled deck

If you draw cards from a shuffled deck, earning $1 for every black card turned over, and losing $1 for every red card, when should you stop?

Langford's sequences - arranging pairs of numbers with distinct gaps

Arranging pairs of numbers into sequences so that there is a distinct separation between each pair.

If you ultimately win a soccer game, what is the probability you were always ahead?

At the final whistle, if you win a soccer game, what is the probability you were winning throughout the entire game?

Why are volcanoes and sand dunes shaped the way they are?

Why are many volcanoes and sand dunes shaped the way they are?

September 2014

If you shine a laser through a tray of cubed Jello, how many get bisected?

What is the relationship between displacement and the number of edges crossed?

What is the best place to let go of a rope swing to go the furthest?

What is the optimal strategy, when swinging on a rope, for letting go to maximize the distance you'll travel?

What would combining all the Worlds flags look like?

If we combined all the flags in the World, would would the result look like?

Message in a bottle:Send and receive one time fortune cookies to random people.

Someone, somewhere in the World will receive a message you write. You'll have no idea who gets it, and they will have no idea who sent it. Think of it like a giant game of fortune cookie.

Lowest Distinct Number auction game

Guess a number with lots of other people and try to guess the lowest unique value.

August 2014

Countdown letters game solver

Tool for helping solve the word rounds in the Countdown game show. Dynamically type letters and see the longest words possible being built.

Countdown numbers game solver

Solver for Countdown numbers game. Input the numbers and the target score and the optimal answer (or nearest possible) will be displayed.

Countdown numbers game. One of the oldest game shows on TV

Analytics, history and rules of the Countdown numbers game.

How modern missile guidance systems work

The evolution of missile guidance systems, from simple to sophisticated.

Why are cans made the size and shape they are?

What is the optimal shape for a can to maximize the volume of food it can contain for the material used?

July 2014

Why are ice cream cones shaped the way they are?

What is the shape of a cone that can contain the largest spherical ball of icecream for the minimum amount of cone material?

What symbol is scribed on Archimedes' tomb, and why?

What is the ratio of the volume of a sphere to the volume of a cylinder?

What is the largest volume cylinder it is possible to carve from a solid sphere?

What is the highest achievable ratio of the volume of a cylinder to the volume of a donor sphere?

Bad Hash: Random trivia about using the substitution cypher A=1, B=2 …

What words are equivalent if we score the letters and add them?

June 2014

The best way to cut various numbers of circular pie crusts from squares of pastry

What is the optimal way to pack circles in square? What is the optimal way to pack spheres in a box?

21 Bite-sized puzzles just hard enough to be solved over a good cup of coffee

Coffee time challenge puzzles. Not too hard, but not too easy. Each should be solvable over a nice cup of tea or coffee.

Confidence levels, sampling, marbles, and Greek urns

If you sample marbles from an urn, what can you learn about the urns contents?

May 2014

Greatest Hits - The top ten most read articles on my blog (by year)

The most popular articles on my blog per year.

Why do I blog? How do I blog?

What is my motivation to blog? What tools do I use to create the graphics, charts and layouts?

Amidakuji - How to shuffle items and run lotteries using just a pen and paper

Popular in Asia. How to run a 'random' lottery to distribute prizes using just a pen an paper.

Friday the 13th is more lucky than you think

Did you know that the 13th of any month is more likely to a Friday than any other day of the week?

Detecting targets in noisy radar signals

By comparing different samples it's possible to find things that stay the same and things that change.

Escaping from a pack of angry, laser toting, monsters using a holographic replicator

What are your chances of escaping a monster using a device that makes replicas of yourself?

April 2014

Calculating geometric means in SQL, and why widescreen TV format is 16:9

There is no aggregate function in SQL to calcuate geometric means. How can you do it? Also, find out the relationship between geometric means and widescreen TV aspect ratios.

What is the lowest possible score in a game of Jeopardy?

If you are really, really bad ae Jeopardy!, what is the lowest theoretical score you could achieve?

Compound Interest: How long does it take to double your money, and just what is 'The rule of 72'?

The most powerful force in the Universe is compound interest - Albert Einstein.

Fuel consumption: Gallons per mile, or miles per gallon?

Why it is more approprite to measure fuel comsumption in gallons per mile, not miles per gallon.

March 2014

Why are loops on roller coasters shaped like inverted tear-drops?

Have you noticed that roller coaster loops all look similar in shape. Why is this?

Roller coasters, Moby Dick, Ski-jumps and accurate clocks (Brachistochrones)

What is the quickest (not the shortest) path between two vertically seperated points?

Counting marathon runners and spying on WWII German tank production

Estimating the total number of tanks an army has using a smaller observed sample.

Bounding rectangles, convex hulls, bullet holes and video games

How to calculate the smallest area rectangle that encloses a collection of points.

February 2014

Can you lose weight by drinking iced water?

If you drink cold water, your body has to warm it up to body temperature. How much energy does this take? Enough to be useful as a weight-loss system?

The fallacy of 'The Gambler's Fallacy'

There is no such thing as the conservation of luck.

Newton and Pepys - A 300 year old probability puzzle

A classic probability puzzle from history.

January 2014

How pressure changes with altitude

Air is a fluid. Our atmosphere is denser at the bottom than the top.

My visit to CES 2014

Notes from my annual pilgrimage to the Consumer Electronics Show.

How to escape from a monster in a dark room

A silly problem involving chasing after a rat in a totally dark room when the rat runs in a random direction.

How to hide from a laser wielding monster using a Corinthian column

A silly problem about how to stay safe by keeping a column between you and a laser wielding monster.

December 2013

Mind reading trick - predicting magic symbols

The computer will read your mind. Can you see how it works?

Mind reading trick - making cards disappear

Think of a card, and the computer will make is vanish. Can you find out how it works?

Pixel scalers. How to rescale bitmap images

Clever ways to scale up pixel art as resolution increases.

Why do pipes burst the way they do?

Why is that pipes always burst along a seam, like sausages?

The difference between risk and uncertainty

What's the difference between knowing the distribution of probabilities and not knowing the distribution?

November 2013

I don't want a smartwatch. I want a dumbwatch!

Smart watches should be extenders, not devices in their own right.

Visual Cryptography - Create perfect secret messages you can see with just your eyes

Methods to store hidden information using just the interference of images before the eye.

How to avoid being turned into monster soup!

The Josephus problem.

QR Codes - How do they work, and how much can you damage them and still have them work?

How far can you distort QR codes, and still use them?

October 2013

De Bruijn Sequences - What does DNA sequencing and guessing passwords have in common?

Efficient ways of running through all possible permutations of a pattern.

How to escape a monster (using calculus)

If you're trapped in a circular lake in a rowing boat, and there is a faster monster on the edge of the lake, how do you escape? (It could happen, and Calculus is your friend).

September 2013

Privacy is dead. Long live Trust!

Debating about privacy is the wrong thing. We really should be talking about trust.

Is it quicker to walk backwards and forward along a travelator, or to one side?

The answer might surprise you, and this has consequences for other situations.

Microsoft, this is what you need to do to save Windows Surface.

It's a chicken and egg problem. To get over the energy barrier, you need to open your wallet. Large incentives are needed.

August 2013

YubiKey, Dual-factor authentication, and ModHex words

fcddtegtheubdiidclkjiuijrbkducjj ilndfhilcrveineihbuvgjijbtfidrku ctndjtllgkhjkbkcdeufeiibvlfiftnu

How to elegantly rotate images

How to rotate images using just shearing and scaling.

Why good customer service is so important to business success

I don't understand how some services just don't get it. Today, great customer service is essential for success.

How are best-fit lines calculated?

How linear regression works.

July 2013

Parity, disk drives, and how credit card numbers work

Why do credit card numbers look the way they do?

Usain Bolt, the World's fastest man. How does he do it?

If Usain ran at top speed over the entire 100m sprint, theroetically, what would his time be?

Exact Percentages, Simplifying Fractions, Prime Factors and Greatest Common Divisors

When you see exact percentages quoted, can you infer anything about the sample size?

How much do you spend in a lifetime on coffee?

When you sit down and calculate it, it's probably more than you think.

June 2013

TEDx Seattle: Photos, thanks and thoughts from the big day

Pictures from the big day, and a link to the video.

Pulling random silver and gold coins out of treasure chests (and mischievous pixies)

A simple logic puzzle.

My Speaking engagement at TEDx Seattle

A humbling and exciting experience.

Selecting a random person (fairly) from an unknown number of applicants

How do you select something randomly (fairly) when you have no idea of the total number of items?

The sincerest form of flattery? Impersonated accounts in Twitter

My Twitter account was duplicated and impersonated. Here is a log of the process I followed to have the bogus accounts removed.

Triple A - Words with three letter A's and no other vowels

There's more than you might think.

Why do sausages split like they do?

Sausages seem to always split lengthwise. What is the science behind this?

Sicherman Dice (and how to cheat at craps!)

Making a pair of dice that produce the same sum as two regular dice, but with different dot patterns.

May 2013

How hungover can you get? Kids blocks and Calculus!

Is it possible to stack blocks overhanging from a table edge so that both edges of the top block are past the edge of the table?

Use all the vowels

How many words can you name that use each of the vowels once, and only once?

Turn an asteroid into a steroid with a broken keyboard

If certain letters of your keyboard don't work, what alternative words can get created that will pass a spell checker?

April 2013

Solving Snake, the classic video game

If you had to write an algorithm to completely solve snake, what would you do?

Old MacDonald had a Perihelion

E-I-E-I-O. What words contain vowels in the order?

Roman Numeral Lengths

How do Roman Numeral lengths change with size?

A case for recursion

To understand recursion, you must first understand recursion. Here recursion is used to solve a common coding interview question.

March 2013

Rock, Paper and Scissors

If you always played the same symbol in a competition with other people who did the same, how does the number of people playing adjust your chances of winning?

l33t speak words (Hex words part 2)

Words made by a combination of twister letters and numbers (geeky and popular with hackers).

You, me, and dead people (Hex words part 1)

If you, me and DEAD people can read hexadecimal numbers, how many people is that in total?

Hilbert Curves - fractal spacing filling fun

Self similar shapes with interesting practical properties.

Growing words, one letter at a time

Start with a word. Add a letter to make a new word, then add another letter. How long a chain can you make?

February 2013

Inefficient rulers

With thought, it is possible to place marks on a ruler so that there is a distinct distance between each pair.

No 'L' quiz

A fun quiz in which removal of the letter 'L' from a word changes it to a different word. Crossword like clues are given.

January 2013

Consumer Electronics Show 2013

Notes from my annual pilgrimage to the Consumer Electronics Show.

Atomic typos - switching adjacent letters

UNCLEAR NUCLEAR. Typos formed by the switching of two adjacent letters that result in another word being formed.

Wheel of Fortune puzzle solver - Win Big!

Tools to help you solve Wheel of Fortune puzzles.

Random or Magic? Can you fool a computer at generating random numbers?

How random are you? Maybe you are more predictable than you think? Try to create a random string of letters, then do the same by flipping a coin. Can the computer guess which is which?

December 2012

Trivial Wheel of Fortune bonus round - how lucky could you get?

What words would be revealed totally in the bonus round without any letters being selected?

Are you worth more in dimes, quarters or nickels?

What is the weight specific value of coinage?

How to mathematically select the best wife (or husband, or secretary …)

If you are interviewing a know number of candidates and have to make a decission after each one, with no return, what is the optimal strategy?

Do you rename your digital photos?

Does IMG_0001.JPG sound familiar to you? How often do people rename their photos?

Elemental Words - words made entirely from chemical element symbols

Chemical element symbols can be combined to make English words.

November 2012

Fat fingers and atomic typos

If you are typing a word, and your finger slips and hits one the the adjacent letters on the keyboard, what words could be made that are still valid?

Discrete Cosine Transforms - How JPGs work, and fun secret images

Details about how JPEG compression works, how to move images from the spatial domain into the frequency domain, and how to combine images with different frequency components to make hybrid images.

How to share secrets securely (without breaking plates)

How can you share a password amongst people so that a defined collection of them (but not all of them) is needed to recreate it?

Where should you stand to answer three phones?

If you are standing next to a wall that has three phones that might ring at random, where should you stand to minimize the average distance you'd have to walk to answer phones if they ring?

October 2012

Analysis of emoticons used on Twitter

What are the common emoji used in Twitter messages?

Prefixing 'S' to words to make new ones

What words exist that you can add an 'S' to the front to make a new word?

Septic Feline - Twenty word puzzles answered by adding an 'S'

A fun quiz in which the addition of a letter 'S' to the end of one word makes a totally different word. Crossword like clues are given.

Logic Puzzle - Gunman and colored dots

A logic puzzle using red and blue dots on the forehead.

Rats live on no evil star - Palindromes and mirror words

Words, that when written backwards, make new words.

September 2012

Is your password too predictable?

An anlysis of the most popular PIN codes in use.

Which fits better - A round peg in a square hole, or a square peg in a round hole?

Which makes a tighter fit?

Maximum Jeopardy! - What is the highest possible score in Jeopardy?

If you answered every single question correctly, the board was configured just right, you uncovered the daily doubles at the appropriate time, and bet with confidence, how money is it possiblre to win on a single game of Jeopardy?

August 2012

The eight Queens problem

A classic problem which requires you to place eight queens on a chess board so that no queen is attacking any other.

'Uncopyrightable' - Distinct letter words

How many word exist in which every letter in the word is unique.

Parrondo's Paradox - Can two ugly parents make a beautiful child?

Two games can be devised that, individually, lose money. However, paradoxically, If played alternately, can make money!

'I had no idea'. Ketchup, rockets, memes and pleated cups

By relaxing the pleats of a sauce cup, it is possible to make it hold more ketchup. Just how much advantage does this provide?

July 2012

Wake up Redmond! (An open letter to Steve Balmer)

Microsoft needs to quickly realize the world is moving mobile fast.

The two eggs interview question

The classic interview question in which you need to determine the height an egg will not break when using the minimum number of drops, and just two eggs.

Intransitive Dice - How to use math to win free drinks from your friends!

How to make a set of dice such that set A can beat set B, and set B can beat set C, but set C can beat set A.

June 2012

Minesweeper First Click: Quality vs. Quantity [GUEST POST]

More advanced minesweeper techniques.

The Golden Gate Bridge is wider at the top than the bottom

Consequences of living on a sphere. How far away in the horizon when you are sitting in a tree? How far apart are the tops of the Golden Gate bridge because of the curvature of the Earth?

How long are your shoelaces?

Depending on how you lace your shoes, the answer could be different.

Advanced Minesweeper

Where is the optimal location to click on classic minesweeper to maximize chances of opening a void?

May 2012

Counterintuitive Conundrums

A collection of classic puzzle inspired by Martin Gardner.

April 2012

Space - It's mindbogglingly big!

If you shrank the world down to the size of a tennis ball, how far away would the moon be? How about the sun? The next nearest star?

Hangman - You've probably been playing it wrong!

There's no easy way to say this, but you've probably been playing hangman incorrectly your entire life.

March 2012

Benford's Law - Never try to defraud an engineer!

Counterintuitive feature about real data and the frequency of occurrence of the first digit.

CQCQ - Mixedup Morse Code

If you send sloppy morse code and the intra-letter and inter-letter gap become the same length what possible confusion can occur?

Padlock Puzzle - Databases and words

Words formed that have the same displacement on letters along the word.

Analysis of Domain Names

Analysis of registered domain names.

Steganography - How to secretly hide things

The science of hiding information inside pictures so that it is not visible by the naked eye.

January 2012

State of the Union Address Analytics

Analysis of the words spoken in Presidential State of the Union addresses. Which President did not say 'God'? Which President talked about 'War' most?

What is the probability of getting a Yahtzee?

You have, up to, three rows. What is the probability of rolling a Yahtzee?

O! Say can you see … (Dating-mining the White House Visitor book)

What can can we learning for examing the names of visitors to The White House?

Facebook finished 2011 with 791 million accounts

Year end Monthly Active user count for Facebook, by year.

A geek plays darts

Where is the best place to aim on a dartboard to maximize the score you might achieve?

December 2011

Algorithm for playing Battleships

What is the optimal strategy to employ when playing Battleship?

Ukrainian Missile Base Tour

A photo tour of my visit to a Ukrainian undergroun missile silo.

Mathematical analysis of the game of Candyland®

How long does a game of Candyland last?

November 2011

Mathematical analysis of the game of RISK®

What is the best strategies to employ when playing Risk?

Markov Chains, Monte-Carlo and Chutes & Ladders!

How long does a game of Chutes and Ladders last?

October 2011

Daily Deal Deluge

Performance of one of the daily deal sites.

Latest WorldWide FaceBook registration statistics

Wordwide Facebook stats for 2011.

September 2011

LivingSocial and the Whole Foods Coupon

How quickly can you give away free money?

August 2011

Update on Worldwide facebook registrations per country

Facebook stats in 2011

728 million facebook accounts

Facebook stats in 2011

June 2011

Microsoft, you suck!

How Microsoft (used to) suck when it comes to treatment of thei guests.

May 2011

Price of soda (per gallon)

The amazing costs of various fluids when you normalize them as price per volume.

Facebook passes 666 million accounts

Facebook stats.

Why has social gaming become so popular?

The trifecta of reasons: Discoverability, Accessibility, Camaraderie.

April 2011

What is a body worth?

If you split a body up into elemental components, what would it be worth?

March 2011

National Pi Day

Looking for Pi inside of Pi.

February 2011

Facebook shutdown in Egypt

Facebook was temporarily shut down in Egypt.

January 2011

Analyzing sales data using names (Part 3)

Analyzing demographics of customers using just first names.

Data mining using just names. A study of names (Part 2)

Androgynous names and death tables.

A rose by any other name. A study of names (Part 1)

A study of the history of names.

December 2010

Generating sparks with recursion

A mathematical way to generate spark effects.

FaceBook Year End 2010

Facebook stats for 2010

Spot the connection

What do all the people in this article have in common?

Demographics of Social Gamers

Do more men or women play social games?

November 2010

Laptop XOR iPad

If you are going to travel, take one device.

Facebook Worldwide demographics (Part 2)

Facebook stats.

Facebook Worldwide demographics (Part 1)

Facebook stats.

Smarter Filling

How to proportionally break up a rectangular region.

All the Single Ladies …

Analysis of the relationship status of facebook users.

Digital Shakespeare (and data cleanliness)

Which actors are on stage at the same time?

Mixed-up Mr. Darcy

N-gram analysis on classic pieces of literature.

October 2010

My trip to Chernobyl, Ukraine

A fascinicating day trip to the site of the horrible Chernobyl accident.

July 2009

My computer plays better Bejeweled than I do

A cheap web cam and a bit of code.

April 2009

A 'practical' use for Genetic Programming

Teaching my computer how to paint.

January 2009

Play better poker in just five minutes

A poker strategy card product I designed a few years ago.

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