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Many tourists (and Londoners) love the Tube as it so easy to navigate. But most don't realise that maths, and some clever design from the 1930s, is showing them the way.
The Tyne and Wear Metro line is laid out in a way that is unlike any other subway on the planet. On a single round-trip, you pass through one station four times, heading in a different direction each time.
Famous problem of Konigsberg bridges has solution nowadays, but in Euler's time it didn't. There were two more bridges, as seen in the picture.