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How are sand dunes formed and why do they even exist?

How are sand dunes formed and why do they even exist?

11 November 2020

The strange, beautiful shapes that sand dunes form are a mystery. Now researchers are conducting huge desert experiments and using dune racetracks to figure it out
Picture of Earth looking very round and blue

Odds on: Five scientific theories decided by wager

15 May 2017

From the existence of black holes to the reality of climate change, over the years some big questions have been the subject of bets,  finds Michael Brooks

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