
3n+1  A simple but unsolved mathematical problem 

Primes  Like 2048, but make the biggest prime number you can 

Sudoku slam  Online sudoku puzzle generator/solver 

The Mathematical Danger of Voting  Elections might seem like they produce results people want, but that isn't always the case. 

Paperclips  Build your own paperclip empire 

Other Worlds  How old are you in Martian years? 

Sleep Calculator  If I go to sleep now, when should I wa... ZZzzzzz 

Secret Santa  How to do Secret Santa properly 

2048  Remember this? Use the arrow keys to combine blocks, try to reach 2048 

Binary comes to life  011010011 

Binary Piano  Who knew counting could be so musical? 

Pi song  You know the words, sing along! 

Days since incident  Tracking natural disasters on Earth 

Mousepoint  A clickless mouse game 

People in Space  How many people are in space right now? 

Combination lock  Addictive "Crack the code" math game  progressive and multiplayer modes. 

Wealth inequality  Scale graphics of wealth inequality in the USA 

Spend  Spend Bill Gates' money 

primes  Ten thousand prime numbers 

Orbis  How long would your trip have taken in the Roman Empire? 

Sell! Sell! Sell!  Scroll down for some scary capitalism statistics 

Paper  Keep folding the paper 

Kamogo Lottery  How long will it take to win? 

Nonogram frvr  Nonogram puzzles. Gorgeous! 

Faith in Humanity  Keeping score on our faith in humanity. 

Correlated  Odd correlations 

Boogie maths  Maths explained through the medium of dance 

xmas clock  Is it Christmas yet? 

McDonalds every second  What McDonalds sells every second 

Progress  Visualizing cycles 

How fast  How fast are you travelling right now? 

Falling time  3D time, constantly falling. 

Dice Simulator  Seconds of fun. Roll 6 ones? 1 in 47,000 chance 

CurrentMillis  How many milliseconds is it since the start of 1970? 

Covid Calculator  Interactive epidemic explainer 

Robot Jobs  Will robots take your job? 

Gridwatch  The UK's National Grid Status 

Desmos Art  Drawing with equations. Check out "Paris street" 

What did Bowie do?  What did David Bowie achieve when he was your age? 

Octamatics  The power of eight 

List of numbers  A list of numbers (incomplete) 
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