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Is there an optimal way to pick the bus routes? This is the question to be answered!

A city has 10 bus routes. Is it possible to arrange the routes and bus stops so that if one route is closed it’s still possible to get from any one stop to any other (possibly changing buses along the way), but if any two routes are closed, there will be at least two stops that become inaccessible to one another?

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

Did 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.
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Why your packages arrive too late: the challenges (and solutions) behind last-mile delivery.
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### Predicting optimal routes in unpredictable networks•

How does your navigation system find the fastest route in a road network, if it does not know where traffic jams occur and how long they last?