This is Pitch Lake, a natural oil seep producing the world's largest natural asphalt lake, in Trinidad and Tobago. This material relates to a paper that appeared in the 8 August, 2014, issue of Science, published by AAAS. The paper, by Rainer U. Meckenstock at Helmholtz Zentrum Muenchen in Neuherberg, Germany, and colleagues was titled, 'Water droplets in oil are microhabitats for microbial life.'
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