Pop-up mints and coins made from prayers

04 Dec 2017

In the tumultuous upheaval of the English Civil War, Royalist castles under siege used ‘pop-up’ mints to make coins to pay their soldiers. A unique display at the Fitzwilliam Museum tells the centuries-old story of emergency currency made from gold, silver and compressed prayer books.

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How to cut your lawn for grasshoppers

22 Nov 2017

Picture a grasshopper landing randomly on a lawn of fixed area. If it then jumps a certain distance in a random direction, what shape should the lawn be to maximise the chance that the grasshopper stays on the lawn after jumping?

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