Solar power is making huge strides as a reliable, renewable energy source, but there's still a lot of untapped potential in terms of the efficiency of photovoltaic cells and what happens at night and during inclement weather. Now a solution has been put forward in the form of producing energy from raindrops. The key to the new process is graphene: a 'wonder' material we've heard plenty about before. Because raindrops are not made up of pure water and contain various salts that split up into positive and negative ions, a team from the Ocean University of China in Qingdao thinks we can harness power via a simple chemical reaction. Specifically,
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