The Saudi Crown Prince wanted to reinvent urban living with his “linear city” stretching 170km across the desert. But with construction on The Line having already stalled, many are asking if the project was ever remotely feasible.

So much of Britain’s diverse wealth of historic railway infrastructure still exists in one shape or another -if you know where to look. TIM DUNN goes exploring

Q What are some of the longest lifespans in fish? A Technically the longest lifespan lies with the Greenland shark, which live a staggering 250-plus years – perhaps even more than 500, in some cases.

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What the scientists are saying…

Malaysia’s urban landscapes double as an architectural record of every culture to have settled here, offering visitors a remarkable glimpse into its complex history