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# Math insight

- Article
### Picking up 13 different cards from 13 piles (Part 1)•

December 4 2023, by Haodong ZhuDid you know that if you divide a pack of cards into 13 piles of 4 cards, then you can always pick one card from each of the 13 piles so that there is exactly one card with each rank? There is some beautiful math behind this puzzle.Read article - Article
### The 100 prisoners escape puzzle•

September 25 2023, by Merel ZoutendijkIn this article, we will discuss a mathematical riddle that "seems impossible even if you know the answer". It is better known as the 100 prisoners problem.Read article - Article
### Structure is everywhere. So is chaos.•

September 21 2023, by Jop BrietPick 45 numbers between 1 and 100. Try to avoid creating pairs whose difference is the square of some number and you will fail. Always.Read article - Article
### Is a rapidly mutating virus unstoppable?•••

June 16 2023, by Martin FrohnHow can one hope to understand the precise structure of a virus if it is able to become unrecognizable within weeks? The mathematics behind this questions didn't let go of my mind for extensive periods of time during my PhD studies in Belgium.Read article - Article
### Is it easier to find half a needle than a full needle in a random network?•••

May 3 2023, by Noela MüllerCommon sense tells us that objects of comparable size should be equally hard to find. Yet, when searching inside a random network, surprises are awaiting . . .Read article