According to UNICEF, one in four people globally doesn’t have safe drinking water in their homes and nearly half the world’s population lacks safely managed sanitation. And according to the World Bank, in many of the hottest and driest regions across a hundred and fifty countries, desalination of seawater is the only thing keeping about three hundred million people alive. Now an Australian research team has come up with perhaps the simplest and cheapest way to produce fresh water yet. And the best part is, it requires less than 20% of the energy used in traditional desalination methods.

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