Seawater.

'De-extincting" the Dodo bird.

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1. An international team of scientists say they have found a way to directly electrolyze seawater into hydrogen, bypassing the need for high-purity water to produce the renewable energy. They said that by introducing an acid layer over the catalysts, water from the Earth’s largest reservoir – the ocean – could be used to create hydrogen fuel. The researchers from Tianjin University and Nankai University in China, the University of Adelaide in Australia and Kent State University in the United States published their findings in the peer-reviewed journal Nature Energy on Tuesday. (Sources: scmp.com, nature.com)