World

Covid-19 immunity: UK study

A woman in a protective mask walks through the Brixton market in South London, as the UK continues to be blocked to help curb the spread of the coronavirus. Victoria Jones | PA Images via Getty Images Immunity to Covid-19 could last only a few months, according to a UK …

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Laser-etched metal purifies water contaminated with sunlight with an efficiency greater than 100%

A water-absorbing, energy-absorbing, laser-etched metal surface, continuously at a direct angle to the sun, provides an economical and efficient way to purify water from sunlight. The technology was developed by Chunei Guo’s laboratory at the University of Rochester. Credit: HM Cao / University of Rochester By engraving metal with ultra-short …

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