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Nearly half of the dikes in the Netherlands have been rejected. Which means they are too weak to protect the country from rising water levels. Raising them might be an option, as well as fortifying them with stones and concrete. If Hans van Kroon has anything to say about it, it will be flowers, however. This ecologist from Radboud Universiteit researches what kind of flowers fortify the dikes the most. He does this by building dikes himself, which he then stress-tests with millions of litres of water.